* Implemented native Gamecube controller support and corresponding emulator hint in ROM header
* Added X and Y buttons to VALID_BUTTONS in sm64.h
* Added workaround in controller type detection for mupen bug
* read GC controllers from port 2
* L to Z logic for GC controller uses a threshold
* Changed threshold for L trig to around 33%
Changed threshold based on feedback
* Added gGamecubeControllerPort
* fixed wrong check
Co-authored-by: Reonu <danileon95@gmail.com>