Code for an RGB lamp.

Compiled with MPLAB X Beta 7.12.
Uses PIC16LF1933 and a 4.2W RBGW LED module.

Provides several functions:

On/Off/Auto switch.  Auto is like on but automatically turns the lamp off
after 5 hours, then back on again after 19 hours, repeating this process
endlessly.

Press and quickly release the button to cycle through the various operating
modes.
  - 1 mode for each color.  In these modes, the lamp is fixed on the
    selected color.
  - A color change mode.  Every 16 minutes, the lamp changes to the next
    color in sequence, repeating the cycle endlessly.
  - A 'party' mode, where colors are cycled rapidly.  The time spent in
    each color and the time spent fading between colors is random.

Press and hold the button to dim and brighten the lamp's output.