Animation reworks and audio effects

Reworked animation scripts
- Single script to rule them all!
- Configurable "hold" frame: Stops the animation in place for a
configurable amount of time.
- Removed half of the previous animation frames as a result.

Sound effects
- Added a bunch of voiceovers and ambient sounds.
- Box sounds are still to come.

Physics Testing Facility
- Press Left Alt to play a random animation and sound!