docs: def enable_signals(self):
          '''
          e.g signal_dict = {signal_path:signal_receiver_path_list, ....}
          :return:
          '''
          signal_dict = self.settings[self.signal_key] or {}
          for i in signal_dict.keys():
              sig_module, signal_class = self.import_class_from_path(i)
              for j in signal_dict[i]:
                  recv_module, recv_coro = self.import_class_from_path(j)
                  signal_class.register(recv_coro)