[Gamecube/Wii] added support for Classic Controller +/- buttons in GUI
[Gamecube/Wii] improved Cheats Menu
[Core/IO] change Master System multitap "official" name
[libretro] fixed "mastertap" support
[Core/MD] fixed ROM padding for Sonic & Knuckles
[Core/VDP] improved Mode 5 sprite parsing accuracy (verified on real hardware)
[Gamecube/Wii] fixed lightgun crosshair & CD leds positionning when using NTSC filter
[Wii] fixed support for 3rd-party classic controllers with invalid calibration settings
[Wii] fixed support for 3rd-party classic controllers with invalid calibration
settings (continued)
Merge https://github.com/ekeeke/Genesis-Plus-GX

Conflicts:
	libretro/libretro.c