More animations

I finally settled into my new place in Sunnyvale, so you can expect more posts here. I added some animations to the LED cube: a heart beat, an elevator, a cube drawing and a slow glow effect. Especially the glow effect is impressive (you can't see the LED blink) and only possible due to the way the cube was wired. Other effects are trickier, though, hopefully I can define one of the trickier ones tomorrow.