0.6.8: Fixes
- Fix colored vertices being incorrectly rendered through instancing
- Fix some miscellaneous bugs with sodium/rubidium
- Fix memory leak associated with model storage Technical/API
- Memory for models is freed when they are no longer in use
- Element buffers now deal in raw gl handles
- Element buffers are no longer considered part of state resoration
- Quad -> Tri element buffer properly resets itself