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.  
In the unit tests, this code executes before the me.pool.init method has been called.  The impact of this particular line is also pretty low, since AFAICS it's executed only once as Melon initializes.  But I shouldn't have left the commented code in place.