Changes/Fixes:

• Fixed deadlock on IOS when pressing Play/Rewind rapidly
• Fixed importing of NSF using the triangle length counter
• Fixed DPCM samples getting mixed up when exporting to NSF/ROM
• Fixed grey square when inputting texture on some Android version (Thanks Steo!)
• Multiple DPI fixes, including manual scaling on macOS (Thanks Steo!)
• Multiple VGM import fixes (Thanks Perkka!)
• Added new DPCM options when exporting to sound engine (Thanks Alex for the feedback/testing!)
• Upgraded to latest Android SDK