Add timestamps to position and behavior events (#147)

* Add timestamps to position events and behaviors.

- Take original event timestamps into consideration so nested tap-holds have proper timing.
- Add position and timestamp to keycode state changed event so the one-shot behavior can properly identify other keypresses and timings.
- Add timestamp to position events received from peripheral

* reduce number of arguments to behaviors

app/include/zmk/events/keycode-state-changed.h

@@ -24,6 +24,5 @@ inline struct keycode_state_changed *create_keycode_state_changed(u8_t usage_pag
     ev->usage_page = usage_page;
     ev->keycode = keycode;
     ev->state = state;
-
     return ev;
 }