ios: Settings values are now loaded from the existing config file.
ios: Remove reference to UI views once game has started.
ios: Make the boolean switches in the settings screen work.
ios: File browser now tries to root itself at '/var/mobile/RetroArchGames' and '/var/mobile' before settling on '/'.
ios: Add a shader option on the settings page (put them in shaders directory just inside RetroArch.app)
     Add a 'None' option to both the shader and overlay settings sub pages to allow them to be disabled.