Add alternate 6 button mapping
Merge pull request #4 from fr500/master

Add alternate 6 button mapping
[Core/Input] fixed Master Tap adapter & XE-1AP device naming in sourcecode
[libretro] fixed Android makefile
[libretro] added support for MD Mouse, lightguns (Menacer, Justifier, Light Phaser), analog devices (Paddle, Sports Pad, XE-1AP) & PICO tablet
Merge https://github.com/ekeeke/Genesis-Plus-GX

Conflicts:
	libretro/libretro.c
[Win32/SDL] renamed Makefile
[Wii] added Wiimote pointer calibration in Menu settings (user request)
[Wii] refactored Wiimote pointer calibration menu
[libretro] improved LightGun, Terebi Oekaki & Pico pointer precision
[Gamecube/Wii] fixed PICO pointer bug
[libretro] fixed MD Mouse Y-axis & added support for XE-1AP second stick (bi-directional)
Merge pull request #6 from Oggom/master

Pull latest changes
[libretro] added core options for inverting MD Mouse Y-axis (needed by Populous II) & showing lightgun crosshair
[Gamecube/Wii] fixed more bugs in cheats menu
[Gamecube/Wii] increased GUI list scrolling speed
[Gamecube/Wii] fixed arrow buttons in Cheats Menu
[Gamecube/Wii] added configurable BIOS & Lock-on ROM support
Merge https://github.com/ekeeke/Genesis-Plus-GX
[Wii] added menu fix for 3rd-party classic controllers with invalid calibration settings