Round trip protection as described in (4)

https://dev.vatsim-germany.org/boards/22/topics/1792?r=1801#message-1801

* Individual context id
* Allows to connect >1 GUIs with core, works for cockpit so far

src/blackgui/cockpitv1component.cpp

@@ -131,7 +131,7 @@ namespace BlackGui
 
     const QString &CCockpitV1Component::cockpitOriginator()
     {
-        static const QString o("cockpit v1");
+        static const QString o = QString("COCKPITV1:").append(QString::number(QDateTime::currentMSecsSinceEpoch()));
         return o;
     }