No SDL_WINDOWPOS_CENTERED

[44100hertz]

[44100hertz]

Now that I think of it, maybe this should be the behavior when no arguments are passed.

[sturnclaw]

SDL_WINDOWPOS_UNDEFINED is the default, as I believe it allows the WM to position the window as needed. I will see about implementing the SDL_WINDOWPOS_X macros as Lua functions to allow positioning on / selecting a default display.