ppsspp: add SDL and headless

[SamLukeYes]

Change the default ppsspp package to SDL front end, as it supports Vulkan, and is allowed to build the headless binary together.

Description of changes

• New packages

  • ppsspp-sdl
  • ppsspp-sdl-wayland

• Packages changed

  • ppsspp now uses SDL front end, includes the headless binary, and supports Vulkan
  • The original ppsspp with Qt front end is renamed to ppsspp-qt
  • Add a desktop entry for the packages above

• Additional notes

  • Qt front end doesn't support Vulkan yet. See https://github.com/hrydgard/ppsspp/issues/11628
  • SDL front end has trouble with Vulkan on Wayland, so Vulkan support is disabled by default in ppsspp-sdl-wayland. See https://github.com/hrydgard/ppsspp/issues/13845

Things done

• Built on platform(s)
  • [X] x86_64-linux
  • [ ] aarch64-linux
  • [ ] x86_64-darwin
  • [ ] aarch64-darwin
• [ ] For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• [ ] Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• [ ] Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• [X] Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.11 Release Notes (or backporting 22.05 Release notes)
  • [ ] (Package updates) Added a release notes entry if the change is major or breaking
  • [ ] (Module updates) Added a release notes entry if the change is significant
  • [ ] (Module addition) Added a release notes entry if adding a new NixOS module
  • [ ] (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• [X] Fits CONTRIBUTING.md.