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

UDPExamples/DecodesModel.hpp

@@ -0,0 +1,43 @@
+#ifndef WSJTX_UDP_DECODES_MODEL_HPP__
+#define WSJTX_UDP_DECODES_MODEL_HPP__
+
+#include <QStandardItemModel>
+
+#include "MessageServer.hpp"
+
+using Frequency = MessageServer::Frequency;
+
+class QTime;
+class QString;
+class QModelIndex;
+
+//
+// Decodes Model - simple data model for all decodes
+//
+// The model is a basic table with uniform row format. Rows consist of
+// QStandardItem instances containing the string representation of the
+// column data  and if the underlying  field is not a  string then the
+// UserRole+1 role contains the underlying data item.
+//
+// Three slots  are provided to add  a new decode, remove  all decodes
+// for a client  and, to build a  reply to CQ message for  a given row
+// which is emitted as a signal respectively.
+//
+class DecodesModel
+  : public QStandardItemModel
+{
+  Q_OBJECT;
+
+public:
+  explicit DecodesModel (QObject * parent = nullptr);
+
+  Q_SLOT void add_decode (bool is_new, QString const& client_id, QTime time, qint32 snr, float delta_time
+                          , quint32 delta_frequency, QString const& mode, QString const& message);
+  Q_SLOT void clear_decodes (QString const& client_id);
+  Q_SLOT void do_reply (QModelIndex const& source);
+
+  Q_SIGNAL void reply (QString const& id, QTime time, qint32 snr, float delta_time, quint32 delta_frequency
+                       , QString const& mode, QString const& message);
+};
+
+#endif