wiiu: add USB keyboard support #83
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This PR adds USB keyboard support via the
nsyskbdlibrary. All of the keyboard code is consolidated intoSDL_wiiukeyboard.c.The Wii U doesn't provide an easy way to just poll for keyboard events, so I put in a "event queue" of sorts that gets processed when events are polled. The queue is hardcoded to a maximum of ten events (but can be changed easily). It may not even be necessary to do it that way anyway, since the keyboard code will only realistically be called by that thread, but I'd rather be safe than sorry.