Support both N64 and GameCube controllers

[jefflongo]

N64 and GameCube controllers use the same underlying protocol. Refactor such that command decoding is implemented as a high level analyzer, so that the low level analyzer can be shared between both controller types.

Currently blocked on Saleae not allowing HLA's to operate on custom LLA's.

[jefflongo]

Seems like C++ decoders can now support HLA's with FrameV2.

[jefflongo]

With #8 , it makes more sense to add the N64 commands directly in the LLA. It should just be a matter of parsing those commands now.