Blender Git Loki

rigidbody: Further fix for background scenes

Since rigid bodies need their world to be be updated correctly we now
pass it alongside the parent scene in scene_update_tagged_recursive().

Add BKE_object_handle_update_ex() as well as other object functions
that take a RigidBodyWorld for this.

Ideally this shouldn't be needed but we'd have to restructure scene
handling for that. It's not a small taks however and definitely not
something that can be done before release.

Thanks to Campbell for review.