WiiU: Gamepad hotplugging support, theoretical multi-gamepad support, warning fixes#10646
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Description
This PR adds support for hotplugging WiiU Gamepads. Critically for users, this makes the driver no longer assume a Gamepad is present, so when it's broken or out of battery or missing; the first Wiimote gets slot 1 instead (helpful when All Users Control Menu is off). I also made it check Gamepad channel 2 - while it's impossible to connect a second Gamepad on a retail console, the code to do it still appears to be there. If that feature ever becomes a thing through CFWs, it'll work here.
Also included some bonus warning fixes that make the input stuff a bit less daunting now -Wall is on.
Related Issues
Nothing filed on GitHub that I know of, though it was discussed on GBATemp.
Reviewers
@Roet-Ivar (requested change, testing)
@gblues (if you want)