Remove __root__ when loading model

I’ve searched the forums for this but there does not seem to be a way to fix this without having to do it every single time you load a model. This can be annoying if you have a model with multiple meshes but we need a boolean flag to prevent babylon from adding a root. I see you guys were doing it because of the UP direction setting but imo we should not be adding additional transforms to meshes without strictly asking the user if that is ok.

Hello! Unfortunately, as you mentioned, we need that transform because of handedness, because the alternative would be to directly change the user supplied mesh and we deemed this more disrupting than simply adding a root.