This makes the mapping from 16-bit color to LUT entry straightforward, while still fully defining the entire range from 0x0000 through 0xFFFF. This fixes an edge case where colors greater than 0xFF00 would wrap past the end of the R/G LUTs onto the next color channel.

The first frame after a new keyframe arrives would be using the wrong interpolation coefficient.

For debugging interpolation code.

This amazingly helps quite a lot! The idle time between frames is down from 0.8ms to 0.66ms now.

This reverts commit 07106959.

This reverts commit f5e7cc2e.

This actually makes us slightly slower, due to increased register pressure, but I think if I can alleviate that we'll see a speedup.

Woo!

This reverts commit 05116f49.

Blah, this increased our delay from 1ms to 1.2ms. Not sure why it seemed to help at first.

This was just for testing, and now it's getting in the way.

This was included in TeensyDuino, but originally wasn't used.