Added map to World Manager.

- Add obstacles to World Manager based on map txt.
- World Manager uses the TileEditor to get the map info.
- I think the tileEditor isn't working properly because I had to do some
tweaking in world manager to get the map data correct.
- Added a new Map file.
- Edited Camera class slightly and made it a singleton.
- World Manager is currently drawing only what is in view of the camera.
- We need a way to draw objects at manipulated coordinates, since we
need to convert each objects position.
- There is no background being drawn yet, just obstacles.