Octave Plugin : Move definition of qtDataStreamVersion to RiaSocketServerDefines

After conversion from NULL -> nullptr the octave plugins failed to compile. By moving the define of qtDataStreamVersion this issue was resolved, and the dependency from oct-files to RiaSocketServer.h was not required anymore (and removed)

ApplicationCode/SocketInterface/RiaSocketServer.h

@@ -20,6 +20,8 @@
 
 #pragma once
 
+#include "RiaSocketServerDefines.h"
+
 #include <QObject>
 #include <vector>
 #include <QDataStream>
@@ -34,11 +36,9 @@ class QTimer;
 class RimEclipseCase;
 class RiaSocketCommand;
 
-namespace riOctavePlugin
-{
-    const int qtDataStreamVersion = QDataStream::Qt_4_0;
-}
-
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
 class RiaSocketServer : public QObject
 {
     Q_OBJECT