Implement window resizing for desktop games/apps

[DanS2D]

To get to feature parity with Windows/Mac, I need to implement window resizing support. There are several gotcha's that arose last time this was attempted as a test. These things should be on my radar to ensure they don't appear in a working version of this feature:

• Solar2D display area gets cut off by the menu bar in the Simulator.
• Touch areas get broken to the point of your clicks registering on objects in the wrong position.
• Occasional black screens in the Simulator window.