Alias PixelFormat.abgr32

Retrieves one of the dsdl.PixelFormat multiton presets from SDL_PIXELFORMAT_* enumeration constants (from SDL 2.0.5)

class PixelFormat
{
  // ...
  alias abgr32 = _multiton!(SDL_PIXELFORMAT_ABGR32,0,5);
  // ...
}