Bugfixes

• Fix font DPI which was incorrect on Windows and macOS and way too small compared to what it should look like.
• Fix that some Faust synths were not detected as such.
• Timing fixes in the arpeggiator and patternist processes.
• Force no app-nap and low-latency support on macOS (thanks to the SuperCollider codebase which has to jump through the same hoops)
• Set a proper font for the source code editor
• Refactor and fixes for video and camera input (in particular, fix a memory leak in the camera feed)