Fixed mistaken $Color to Color
Updated TASKS. Placed Done items at the bottom.
Added support for loading external TileSets tsx files in TiledMap
classes
Removed EntityCallback in LoadMap and replaced it with MapLoaded event
in TeeEngine
Minor changes to the map file
Updated tsx files
Added support for specifying Content path in tilesets and for placing
tsx files and tmx files in folders other than the root Content folder.
Renamed ObjectLayer to TiledObjectLayer and MapObject to TiledObject