Re-implement remembering of old movetype for objects, and also persist it in storage...

Re-implement remembering of old movetype for objects, and also persist it in storage. For example: If you set an object to MOVETYPE_PHYSICAL, attach it to another object (during which it becomes MOVETYPE_FOLLOW), restart the server, then go back and detach the object, it will know to go back to MOVETYPE_PHYSICAL. This does not add any extra info, as movetype was already added to the storage for child objects, and was useless before this.