Maintenance update.
- Correct bitdepth and audio format are now shown in sample file requester
- Fixed a double-free bug which could cause a crash on sample import
- Improved and corrected audio initialization/playback via SDL2
- Device can be chosen instead of always using the default output device
- Audio device setting is stored separately from BASS audio device setting
- No longer using deprecated API calls
- Improved the way libraries are loaded on Linux
- Set RPATH in binary, don't use custom dynamic loader code/APIs
- Removed some dependencies for a smaller binary and cleaner code