- replaced Model class in box demo with library's Model class
- switched GL context profile mask to compatibility in Windows builds
- only open audio device if audio is initialized
- increase default audio frequency and buffer size
- convert path objects to strings for compatibility with MinGW
- update MinGW builds to use regular filesystem library instead of experimental
- remove default texture index from Model class
- add support for two textures to Pad class
- restore SDL audio mixer initialization parameters to SDL defaults
- add optional log level to SDL error logging function