docs: def destroy(self):
          """ Destroys the clipboard by relieving all model references.
          """
          self.destroy_all_models_in_dict(self.model_copies)
          self.model_copies = None
          self.copy_parent_state_id = None
          self.outcome_id_mapping_dict = None
          self.port_id_mapping_dict = None
          self.state_id_mapping_dict = None