KEmulator nnmod v2.21.3

Features:
- MIDI playback with MA-3/MA-5 emulator (#290)
- Improved automatic updates security (#272)
- Added 640x480 device preset
- Made Class Watcher window attachable to main window

Fixes:
- Fixed MIDlet.platformRequest (v2.21.2 bug)
- Fixed SMAF phrase player API
- Fixed crash when going to full-screen mode with logs window open
- Fixed Class Watcher rendering on Linux
- Forced GDK_BACKEND to X11 to fix multiple issues on Linux with Wayland

Download: https://nnproject.cc/kem
GitHub: https://github.com/shinovon/KEmulator