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/blackcore/context_simulator.h

@@ -42,6 +42,9 @@ namespace BlackCore
             return s;
         }
 
+        //! \copydoc CContext::getPathAndContextId()
+        virtual QString getPathAndContextId() const { return this->buildPathAndContextId(ObjectPath()); }
+
         //! Destructor
         virtual ~IContextSimulator() {}