Fullscreen support and viewport cleanup

[Warren Alphonso]

Understand how I can support full screen and window resizing a certain ratio. Don't have to accommodate all ratios. Here's a tutorial. Yeah, just accommodate two sizes: initial size and fullscreen. Technically this allows any ratio but it means I can get away without worrying about text wrapping or image layout. I can figure out custom resizing later.

Also, allow for vertical scrolling. Clean up viewport management.