GameShell OS image files (v0.4 latest)

**v0.4 latest release note:**
Updated Linux Kernel to 5.2.RC4
Activated midi device support in Kernel by default (Tested with AKAI MPK mini, using USB OTG cable), preinstalled samplerbox in /opt
Updated Launcher to v1.25
Optimized menu icons and orders
Launcher now support theme selection, added OP1 dark theme provided by @stingray
Added more Indie Games, including Planet-Busters (Q1 Game Jam), No. 909 (Q1 Game Jam), 2048, Hurricane.
We will bring you more exciting Indie Games through future Launcher updates.
Added more preset emulators and our communit