Added a project for the TileEngine, that will be used by the game itself and the level editor.
Added the MapSquare class, that represents an individual tile in the game.
Added declarations to the MapSquare class.
Added a constructor to the MapSquare class.
Added TogglePassable method to the MapSquare class.
Changed MapSquare class to public.
Added the Camera class to the TileEngine project.
Added declarations to the Camera class.
Added properties to the Camera class.
Added several methods to help transform screen coordinates into world coordinates.