Add new emulators, fixes/updates, and tweaks

- test7800 Atari 7800 emulator
- StarPSX, new PS1 emulator
- ARMSX2, a fork of PCSX2 for Android
- update NXEmu license
- Sudachi project has been discontinued
- Add some fixes to the Switch warning text
- Add Deecy, new Dreamcast emulator
- DreamPotato, Dreamcast VMU emulator
- Add Mattel HyperScan section and add the only known emulator (besides MAME)
- Add coffee-gb, Game Boy/Game Boy Color emulator
- guac, Game Boy/Game Boy Color emulator
- RetroGBm, GB/GBC emulator
- melonDS launcher, launcher for mleonDS
- Fujisan, a frontend for Atari computers
- MainicEmu and Folium, iOS multi-emulators
- LCL, libretro core launcher, a launcher for libretro cores

Author: DerekTurtleRoe