Add support for secondary UTC display.
Ensure the longitude is initialized.
A bunch of UTC-related changes.
Update radix point display.

Show “;” for DOT in base 12 and fall back to DOT (instead of using “?”) if bases don’t match.
Improve handling of numerals >9.
Fixes to UTC and solar time.
Add support for “DST” radix point.
Remove something that slipped in and breaks the build.
Switch from tick handler to timer.

This should decrease frequency of ticks and make the updates more consistent.