About to implement a more useful UI.
Stuff...
More stuff.
Using 'ClickButton' library.
Stuff...
Less than half-baked...
Added rainbow_NB (non-blocking).
Added rainbowCycle_NB.
Aded black_to_white_NB.
Added brightness control for the white-only mode.
Added speed control to rainbow_NB and rainbowCycle_NB.
Shifting blocks of code around.
Tweaks.
Added some HSV colour space stuff.