Retropie 4.6 28th April 2020

Changes since 4.5

- Raspberry Pi 4 support! Support is labelled as beta currently as there are still things to improve, but most emulators now run well.
- The RetroPie images are now based on Raspbian Buster - Stretch is no longer supported by Raspberry Pi (Trading) ltd. RetroPie will stop updating pre-built binaries for Stretch later in the year.
- Improvements to RetroPie packaging system and core RetroPie-Setup code so package state is remembered and binary updates will only be done if an updated binary is available. Source installs won't be overwritten by a pre-built binary when updating also. We started providing pre-built binaries for the packages in the experimental section for the supported platforms. 
- RetroArch updated to v1.8.5.
  - New notification system with cheevos badges support.
  - RGUI can be themed.
  - Support for real CD ROM, with the ability to dump the disc image.
  - Improved disk control system, with support for labeling disks in .m3u files.
  - RetroAchievements support for PS1/Sega CD/PCEngine CD.
- EmulationStation updated to v2.9.1.
  - Scraper fixes for the TheGameDBNet.
  - Grid view improvements and bugfixes.
  - Theming improvements.
  - New options for "disable system name on custom collections" and "save gamelist metadata after each modification".
- Added videomode switching support to runcommand for KMS and X11 targets. SDL2 applications only.
- Added ioquake3 module for platforms other than Raspberry Pi 1-3.
- Replaced zdoom with lzdoom as zdoom is no longer maintained.
- amiberry - updated to 3.1.3 including ipf support.
- stella - updated to 6.0.1.
- SDL updated to 2.0.10 with rpi4/kms fixes.
- solarus - lots of updates to modernise the port.
- eduke32 - major overhaul including adding package for IonFury.
- zesarux - updated to v8.0.
- cgenius - updated to v2.3.6.
- drastic - update to 2.5.0.4 with RPI4 compatibility.
- scummvm - updated to v2.1.1.
- atari800 - updated to v4.2.0 (lr-atari800 config has been moved to lr-atari800.cfg to avoid conflicting)
- lr-mupen64plus / lr-mupen64plus-next - enable GLES3 support on rpi4.
- lr-opera - renamed from lr-4do.
- Sonic Robo Blast - updated to 2.2.
- Lots of other fixes and improvements.
  - Added new experimental modules.
  - vvvvvv - Port of the popular platform / puzzle game VVVVVV.
  - lr-neocd - Neo Geo CD emulator.
  - redream - Dreamcast emulator for the Raspberry Pi 4.