* Move from .c to .h as needed for consistency.
* When missing from both, copy from pull request or wiki.
* When missing entirely, infer functionality from source code.
watch faces that handle EVENT_LIGHT_BUTTON_UP but not EVENT_LIGHT_BUTTON_DOWN
probably don't want the default EVENT_LIGHT_BUTTON_DOWN LED activation behavior
- switch indicators: use signal indicator instead of bell indicator
- make indicator show up only when there is an active alarm in the next 24 h
- Implement "hidden" UI tweak: extra long press of the alarm button in normal mode jumps back to alarm no. 1
- update comments to reflect latest changes