Spec out and build UI to control eyes

[aphexcx]

Let's whiteboard this a bit. Points discussed:

• We can make it control an arbitrary number of sharpies, not just 2 eyes
• We can build on the current DMX interface implementation
• Sharpies are at Steve Guilliam's place, we can use them to test

[r3dcrosse]

Need:

• Positions of the eyes in the same coordinate space as the XY input
• Need height of eyes above the ground (z coordinate)
• Any range restrictions on the eyes? Sharpies won't move past certain points. Need to know what they are