Allow moving objects from one room the other

[ActuallyaDeviloper]

Consider the case that one has the option to draw neighboring rooms enabled. (Should be the default case in the future)

Currently it is not possible to move objects (lights, statics, movables, cameras, sinks, ...) from one room to the other, even though it is right there. We should automatically move the objects from one room to another if they cross a portal.