Added hour-/minute-/second-setting functions.
Bug fixes, lots of new interface functions, some added functionality.

- Added 12/24 hour mode methods.
- Fixed a bug involving 12/24 hour time setting.
- Added EClock to reduce code repetition with targeting
time/alarm1/alarm2.
Reached base level of setting an alarm in 12/24 hour mode, and switching
to between the two giant, ugly chunks of code in loop()-- time checking
and debugging, or tweaked AdaFruit NeoPixel strand test.
Note that Uno is no longer sufficient, must use Mega or another with
more memory (due to number of LEDs in our setup).