Rename state files to GameStates.x.js or States.xyz.js

[sole]

Currently the game states are defined in js/game/game.js and js/game/preloader.js. Plus the GameStates variable is defined inside preloader.js.

To improve readability and make this hierarchy more visible by looking at the files, I'd suggest to...

• move the definition of the GameStates variable out from js/game/preloader.js and onto a new file called /js/game/GameStates.js
• rename js/game/preloader.js to js/game/GameStates.Preloader.js
• rename js/game/game.js to js/game/GameStates.Game.js

I reckon that so many game in the paths can be tedious. I'd go even further and suggest just using States where it says GameStates. What do you think?