Fixing the platform and window to not show the window until the run loop starts. This is more accurate with XNA's behavior and generally just looks better (since the window isn't shown until after the graphics settings are applied and OpenGL is initialized).
Simplifying the window fix based on feedback so that we don't need the new internal method.
Merge pull request #220 from brushfiregames/monogame-sdl2

Hiding game window until run loop begins