Classes
 ClassDescription
 FlxBasic 
 FlxButton A simple button class that calls a function when clicked by the mouse.
 FlxCamera 
 FlxEmitter FlxEmitter is a lightweight particle emitter.
 FlxG This is a global helper class full of useful functions for audio, input, basic info, and the camera system among other things.
 FlxGame FlxGame is the heart of all flixel games, and contains a bunch of basic game loops and things.
 FlxGroup This is an organizational class that can update and render a bunch of FlxBasics.
 FlxObject This is the base class for most of the display objects (FlxSprite, FlxText, etc).
 FlxParticle 
 FlxPoint Stores a 2D floating point coordinate.
 FlxRect Stores a rectangle.
 FlxSave A class to help automate and simplify save game functionality.
 FlxSprite The main "game object" class, handles basic physics and animation.
 FlxState This is the basic game "state" object - e.g.
 FlxText Extends FlxSprite to support rendering text.
 FlxTileblock This is the basic "environment object" class, used to create simple walls and floors.
 FlxTilemap This is a traditional tilemap display and collision class.
 FlxU