recfactoring + can now draw rectangle objects

-Turned getObjectsAsLines into getPolygonObjectsAsLines because not all
Tiled objects contain polygons.

-Created getRectangleObjectAsPhaserRectangle because, again, not all
Tiled objects contain polygons. If the object contains 4 points, no
polygon attribute is in the object. Instead, only the x, y, width, and
height are provided.

-Now drawing the "walls"