* 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.
* chirpy demo face; activity face stub
* activity face WIP: can log, pause and clear
* activity face and chirpy demo: ready to flash to watch
* activity face tweaks
* hour display for hours < 10
* fix: added rogue paused seconds when stopping activity
* LE mode; lower power with 1Hz tick
* fix: midnight is 12
* Documentation in code comments
* fixes from code review by @neutralinsomniac
* chirpy_demo_face option to chirp out nanosec.ini + auto-format
* UI tweaks
* remove erroneously added file (content revoked)
* UI tweaks: return from LE mode; time display vs LAP
* add default loop handler (will enable long-mode-to-first-face)
* reset watch faces to match main branch
