Extend UDP status message - added Rx/Tx DF, call and grid information

Build now creates and installs a  UDP library that contains the server
side  of the  UDP messaging  facility.  This  library is  used by  the
udp_daemon and message_aggregator reference  examples. The new library
is  currently a  static archive  but  can also  be built  as a  shared
library.  The library  allows third  party Qt  applications to  easily
access UDP messages from WSJT-X.

Refactored  the  message_aggregator  reference example  to  split  out
classes into  separate translation  units. Added new  functionality to
exercise  the  new  UDP  status fields,  highlight  own  call,  CQ/QRZ
messages and decodes near Rx DF.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6691 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

RadioMetaType.cpp

@@ -0,0 +1,20 @@
+#include "Radio.hpp"
+
+#include <QMetaType>
+#include <QDebug>
+#include <QDataStream>
+
+namespace Radio
+{
+  void register_types ()
+  {
+    qRegisterMetaType<Radio::Frequency> ("Frequency");
+    qRegisterMetaType<Radio::FrequencyDelta> ("FrequencyDelta");
+    qRegisterMetaType<Radio::Frequencies> ("Frequencies");
+
+    // This is required to preserve v1.5 "frequencies" setting for
+    // backwards compatibility, without it the setting gets trashed
+    // by later versions.
+    qRegisterMetaTypeStreamOperators<Radio::Frequencies> ("Frequencies");
+  }
+}