Replaced many blurry app icons, instead using icons from higher resolution sources.
Revised iOS app icon color & spacing slightly, attempting to match the pattern used in the recent Android and Switch versions of RetroArch.
- add tvOS target
- support code signing tvOS cores by adding an argument to the code signing cores script
- use NSCachesDirectory for the documents directory
- add some mfi controller handling logic to set non-game controllers to the last index to avoid interfering with operation
- autodetect mfi controller for apple tv on startup - added autodetect to hid joypad
- added a webserver to transfer files for tvOS
- xcode: clean up project, remove unused folders
- remove HAVE_MATERIALUI setting for tvos build, make it use XMB as default
- added retroarch app icon courtesy of @MrJs
- added auto-detect of mfi controller for apple tv
