Lots of cleanup.

* Ball now accurately collides and returns from both paddles. It's almost a game!
* Turned wireframe off.
* Decided to make non private members in classes not begin with m_, I think that is standard?
* Fixed ugly branching logic in paddle update. Now it sets which keys to use for up, down, right, left etc.
* Did I accidently make the shaders pink before? That's back to white.
* All GetFoo() functions should return const reference. This probably still needs a little more fixing in other classes.
* Main had a lot of prints.

Happy Thanksgiving! Eat lots of turkey and code pongggggg.