Improvements:
- Notes can now be hidden.
- Colors for the background lines, texts, keyboard, sharp/flat keys can be customized.
- Flashes can be tinted and resized.
- You can access debug options by pressing the 'd' key, and can now dump all parsed MIDI events and generated notes in the console log.
Bug fixes:
- Controller pressure and unknown MIDI events are now ignored when computing a track timing.
- Updated GLFW on macOS, should improve Mojave performances.