New UDP message SwitchConfiguration(14) to switch to an existing configuration

The Status(1) message also acquires  the current configuration name as
a new  field. See  NetworkMessage.hpp for  details. The  UDP reference
example program message_aggregator acquires the ability to display and
change  the configuration  of a  WSJT-X client  to exercise  these new
features.

UDPExamples/UDPDaemon.cpp

@@ -51,7 +51,7 @@ public:
                              , bool /*transmitting*/, bool /*decoding*/, qint32 /*rx_df*/, qint32 /*tx_df*/
                              , QString const& /*de_call*/, QString const& /*de_grid*/, QString const& /*dx_grid*/
                              , bool /* watchdog_timeout */, QString const& sub_mode, bool /*fast_mode*/
-                             , quint8 /*special_op_mode*/)
+                             , quint8 /*special_op_mode*/, QString const& /*configuration_name*/)
   {
     if (id == id_)
       {