Switch to raw clicks to improve timing
Switch to raw clicks to improve timing

The previous use of window_single_click_subscribe caused Pebble to implicitly
animate the button presses. This was making it impossible to reliably detect BPM
> 130. window_raw_click_subscribe avoids the animation, preventing delayed
clicks. The animation was implicitly dirtying the layer for us, so we now also
need to call layer_mark_dirty manually.

aarmea/bpm-pebble,aarmea/bpm-pebble,aarmea/bpm-pebble