Starts the QAManagerBase for receiving incoming messages in message listeners.
The QAManagerBase does not need to be started if there are no message listeners set, that is, if messages are received with the getMessage methods. It is not recommended to use the getMessage methods as well as message listeners for receiving messages. One should use one or the other of the asynchronous (message listener) or synchronous (getMessage) models.
Any calls to start beyond the first without an intervening QAManagerBasestop() call are ignored.
True if and only if the operation succeeded.