Documentation for MCprep internal functions

[StandingPadAnimations]

Basically as the title says, a documentation page that explains what internal functions do (something similar to the Blender API docs). I'll start working on the documentation.

Right now, the thing that really needs documentation is util.py. I'll add more to the list if needed.

Things to add to the docs:

• Entirety of util.py

[StandingPadAnimations]

Closing this as completed, though some improvements are needed