feature(modifiers): add explicit modifiers

this makes LS(LEFT_CONTROL) work as if shift and control were both
pressed explicitly. Previously, the left shift would have been released
as soon as another key was pressed. The implicit behavior is useful in
case of LS(NUMBER_1) when rolling over to other keys.

Also see #361.

app/tests/combo/combos-and-holdtaps-0/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0xe0 mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0xe0 mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0xe0 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0xe0 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/combos-and-holdtaps-1/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/combos-and-holdtaps-2/keycode_events.snapshot

@@ -1,2 +1,2 @@
-pressed: usage_page 0x07 keycode 0xe0 mods 0x00
-pressed: usage_page 0x07 keycode 0xe4 mods 0x00
+pressed: usage_page 0x07 keycode 0xe0 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0xe4 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/multiple-timeouts/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x04 mods 0x00
-pressed: usage_page 0x07 keycode 0x05 mods 0x00
-released: usage_page 0x07 keycode 0x04 mods 0x00
-released: usage_page 0x07 keycode 0x05 mods 0x00
+pressed: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x05 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x05 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/overlapping-combos-0/keycode_events.snapshot

@@ -1,20 +1,20 @@
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/overlapping-combos-1/keycode_events.snapshot

@@ -1,8 +1,8 @@
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/overlapping-combos-2/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/overlapping-combos-3/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x04 mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x04 mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/partially-overlapping-combos/keycode_events.snapshot

@@ -1,16 +1,16 @@
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1b mods 0x00
-released: usage_page 0x07 keycode 0x1b mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
-pressed: usage_page 0x07 keycode 0x1c mods 0x00
-released: usage_page 0x07 keycode 0x1c mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1b implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x1c implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/press-release/keycode_events.snapshot

@@ -1,8 +1,8 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/press-timeout/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x04 mods 0x00
-pressed: usage_page 0x07 keycode 0x05 mods 0x00
-released: usage_page 0x07 keycode 0x04 mods 0x00
-released: usage_page 0x07 keycode 0x05 mods 0x00
+pressed: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x05 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x04 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x05 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/press1-press2-release1-release2/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x07 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/press1-press2-release2-release1/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/press1-release1-press2-release2/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x07 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/slowrelease-disabled/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x07 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00

app/tests/combo/slowrelease-enabled/keycode_events.snapshot

@@ -1,4 +1,4 @@
-pressed: usage_page 0x07 keycode 0x06 mods 0x00
-pressed: usage_page 0x07 keycode 0x07 mods 0x00
-released: usage_page 0x07 keycode 0x06 mods 0x00
-released: usage_page 0x07 keycode 0x07 mods 0x00
+pressed: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+pressed: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x06 implicit_mods 0x00 explicit_mods 0x00
+released: usage_page 0x07 keycode 0x07 implicit_mods 0x00 explicit_mods 0x00