Implement rotation and scaling support for M2 UV animations

[fallenoak]

Some M2s make use of more than just translation for UV coordinate animations. In particular, rotation and scaling are also possible to animate. In order to support proper display of these M2s, we should hook up rotation and scaling tracks in the UV animation logic currently present in M2s.

Progress

• Implement rotation support in UV animations
• Implement scaling support in UV animations
• Find M2 that uses rotation in UV animations and ensure our implementation in Wowser looks right
• Find M2 that uses scaling in UV animations and ensure our implementation in Wowser looks right