Add support for custom controller profiles

[eadmaster]

Should make easier to add support for more generic USB controllers.

May reuse profiles from other projects like these:

• https://github.com/Maschell/controller_patcher_configs
• https://github.com/libretro/retroarch-joypad-autoconfig

I'd also like a way to map wiimote gestures to digital buttons as a fix for these games.