The most common Component objects now have userData pointers.  Now tracking UIImage user in the Component so we delete associated textures when we're done with them.  Cleaned up the naming for screen space calculation a bit.  Layout layer further debugged.  Screen space generator more efficient with disabled objects.  Label rendering now being done in a dispatch queue.  Fixed a bug with sub texture ID contention.  Spherical earth chunk layer now correctly handling rotation.  Spherical Mercator needed a bit more accuracy.  Vector subdivide to surface working correctly.