Base for a ResourceHandler class

Adds the base of a class for handeling the loading and unloading of
resources such as audio, fonts, and, textures.
Added TextureHandler

Part of ResourceHandler
Removed a comment from Program.cs

That shouldn't have been there.... :P
Merge remote-tracking branch 'origin/master' into Resourcehandler
Added FontHandler + modified TextureHandler

Added a base for a FontHandler class.
Removed some indexers for TextureHandler
Added functions for fetching texture and category names based on index
FontHandler constructors are now public
Merge pull request #9 from Badassitude/Resourcehandler

Resourcehandler