Add support for outputting to Nintendo Gamecube

[HiramSilvey]

Arduino support for this is here: https://github.com/NicoHood/Nintendo
In order to support Teensy 4.0+, the protocol needs to be re-written since the NicoHood library is written specifically for the AVR cpu architecture. Since the Teensy is so much faster than the Arduino, though, it may be possible to implement the protocol using bit-banging rather than inserting the exact number of NOP instructions.