Added basic animations

Got a working animation sequence for RectPrisms. Pressing ENTER will try
to move all the RectPrisms to (20, 20, 10) over a period of 5 seconds.

Issues:
-RectPrisms move asymptotically, not linearly. I used the wrong math for
the travel animation, it should be more like (totalDistance /
movementTime) * timeElapsed
-Still not 100% sure I'm using the framebuffer right, but it doesn't lag
so I won't complain.
-Consider making motion controllers so animations can be more flexible
(Ex. Bounce controller, linear controller, ease in controller, ease out
controller, etc...)