Updated several things

renamed gamecube.pde to gamecube.ino for modern arduino IDE

Put initial GC controller status for control stick zeroing in a loop
since my controller sometimes would erroneously return 0 for its control
stick reading. I think the controller is messed up, but this still
ensures a reading that is more likely to be correct.

Set serial speed to 115200

put GC controller initialization into a separate function

Added a few serial debug prints for controll stick debugging (like I
said I think I have a buggy controller)

Set no control stick adjustments by default.

Added checks to see if the GC controller isn't responding. If not, will
attempt to reinitialize, and send a neutral (no buttons pressed) to the
N64