This replaces "Check Battery" and adds the following info:
* Firmware version
* RTC chip type
The firmware version is #defined in Watchy.h. There might be a
way to do this that's friendlier to the library release process,
but I'll leave that up to the people who actually build the releases.
I plan to extend the About menu with some radio-related info as
I work on getting BLE pairing working with my iPhone.
- Added native NTP sync support
- Fixed bug with WiFi AP not working due to busy lightsleep callback
- Removed year offsets and use TimeLib macros for consistency