Game engine updates

-The level file is now loaded and parsed within the init() function. Document ready is gone.
-STARTED working on an enemy object. That doesn't mean there's a working one that's visible and running around yet.
-Got rid of the platform[] and collectable[] arrays. All game objects (other than the player currently) are now loaded into gameObjects[][]
--The TYPE_* "constants" will define which row holds which objects.
-The level file is now a constant so it can be changed easier
-Platforms, moving platforms, etc. are now actual functions rather than functions loaded inside a variable. Gone with the rogue copies!