Inlined some method calls in me.TMXOrthogonalRenderer.drawTileLayer

A couple of method calls in drawTileLayer were creating garbage unnecessarily, i.e. `me.Vector2d` objects which were immediately released.  Inlining these methods gives us slightly less elegant code but saves us some cycles on garbage collection.  
Shapes don't hold a reference to the position vector which is passed to them.  They universally create their own position vector and then call `setV` on it, which simply copies `x` and `y` values.