r9 - Minor Fixes + Updated devkitPPC

Minor fixups, update toolchain

r8 - Minor Fixes + Updated devkitPPC

Exit logic had a minor bug, this has been repaired.
Updated to the latest devkitPPC, this supposedly fixes the reset button issue on GameCube, but this has not been console verified.

r7 - Multithreading + GC support

Move controller polling to a separate thread.
Create a GameCube Makefile.

GameCube builds just fine, but has not been console verified yet. Gamecube has been console verified by @MethodOrMadness - Reset button seems to be not working, otherwise OK.

v6

Fix typo

v5

Old versions would freeze the donut when closing.

Now a goodbye message is shown

v3

Updated controls:

Return to HBC/loader -- Wiimote: Home -- GC: Start -- Console: Reset

Poweroff console -- Wiimote: Power button -- Console: Power button

Toggle debug output -- Wiimote: 1 -- GC: Y

Adjust rotation speed (axis "A") -- Wiimote & GC: DPAD left/right

Adjust rotation speed (axis "B") -- Wiimote & GC: DPAD up/down

Reset rotation speed (both axis) -- Wiimote: 2 -- GC: X

Fixed the homebrew channel icon to be the correct size.

v2

Add GC controller and console button support

Can now exit to loader with Wiimote home, GC start/pause, or console reset button.
Can now shutdown to standby with Wiimote power button or console power button.

v1

Initial release