IceBeats v0.2 Beta

Man this thing's been a wild ride - some major changes may happen soon, posting a release to mark the time before I take a sledgehammer to the codebase... again.

• Finished visualization effect: Pitch (maps audio frequencies directlyish onto the LED strip)
• Automatic visualization and color palette swapping
• (Optional) Automatic music-based palette generation
• Added support for a second LED strip - Blinks to bass kicks
• "Bass kicks" are now controlled by Stepmania's lighting output (when available, generally works better than my beat detection code)

Codebase tidying:

• Split the sketch into several source files (why didn't I do this before???)
• The update loop implementation is less ghetto now (Timing with millis for a specific FPS >>>> delay(), fixing another very questionable coding decision!)