- 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
- finish adding #pragma once to headers
- move configuration initialization into Game class
- print debug to stdout by default
- explicitly pass file to refresh to config auto refresh
- add delegate to sb namespace and deprecate get_delegate() in favor of delegate()
- set custom log function before loading config
- raise exception when no model textures are available