Storytime: Cucky's original SDL2 port work involved using SDL2's
threading API to emulate the original WinAPI threading.
I can't be assed with that stuff, so I used the same trick Cucky did
for the Wii port, and hooked Organya up to the SDL2 audio callback.
This actually opens up the possibility for perfectly-synchronised
Organya playback. By that I mean, instead of needing a super
low-latency audio callback, I can have the callback synchronise its
audio mixing with Organya itself. I haven't done it yet, I plan to
soon.
Okay so WindowsWrapper.h now just includes Windows.h if it wants
non-portability. This meant I had to split the custom RECT struct
back to the original RECT and unknown nameless struct (one uses
left/right, while the other uses front/back).
