Use threejs for viz of plant model values

[matthewturk]

Pretty basic right now, but using UV values to map onto a colormap texture. I'm a bit stymied by the way I've got it set up to work; I think I will be splitting all the threejs stuff into a different file, and a different class than Scene as that's getting overloaded. That would also make it possible to set up listeners between the array values so they can auto-update.

• Split into new class
• Add listeners for the values
• Have values tied back to the Model object so they can be mapped into uv attributes
• Selector for colormap
• UV transform for colormap limit adjustment