* Added sound menu which keeps in sync with pressing sound button
* Changed navigation behavior between scenes to go straight to next
level if it hasn't been beaten, otherwise return to level select
so the player can view their progress in the set
* More drawing optimizations
* Added a proper event loop
* Added minimal menu bars
* Added about menu
* GameWindow initializes a GameEngine (even if you can't play it yet)
* Updated variable naming conventions
