docs: void notifyOmemoCarbonCopyReceived(CarbonExtension.Direction direction,
                                         Message carbonCopy,
                                         Message wrappingMessage,
                                         OmemoMessage.Received decryptedCarbonCopy) {
          for (OmemoMessageListener l : omemoMessageListeners) {
              l.onOmemoCarbonCopyReceived(direction, carbonCopy, wrappingMessage, decryptedCarbonCopy);
          }
      }