NWPActorVariableProperties is not destroyed when deleting its ActorVariable
- When removing an actor variable, its NWPActorVariableProperties should be destroyed
- When changing an actor variable, it should be checked, which NWPActorVariableProperties are still required and whether new ones are needed. If the existing ones stay, do not delete their properties!
- in MGLResourcesManager::deleteActor(): The ActorVariables might have to be deleted before 'emit actorDeleted(actor)' is called.
- The NWPActorvariableProperties should probably be deleted while the ActorVariable is still alive.