More SDL wrapping, another test, and misc changes

Wrapped SDL_Color, SDL_Rect, SDL_Renderer, and SDL_Window in their own
classes with constructors, destructors, and some methods. Window --  the
wrapper for SDL_Window -- and Renderer -- the wrapper for SDL_Renderer
-- does not wrap all functionality; this is something to do in the
future.

The test winrenfunc,.cpp tests creating a Window, creating a Renderer,
drawing a rectangle, closing the Window, and SDL cleanup. It also
utilizes Rect and Color.

Improved some of the documentation of FrameLimiter. Also changed all int
fields to unsigned int and all associated functions because negative
values don't make sense when it comes to FPS.

Removed some debug output from the framework because man it was
annoying.