Ref T232 clear remote aircraft data once network disconnects

* blackconfig in .pro
* verify function to detect dangling states
* clear remote data when disconnected from network
* there was one problem that the data where not correctly cleaned up and hence new aircraft where not added again after a disconnect/reconnect from network
* it is not yet clear why data happens (dangling data), that is what the debugVerify function is for

src/blackcore/simulator.h

@@ -160,6 +160,13 @@ namespace BlackCore
         //! Driver will be unloaded
         virtual void unload() = 0;
 
+        //! Clear all aircraft related data
+        virtual void clearAllRemoteAircraftData() = 0;
+
+        //! Debug function to check state after all aircraft have been removed
+        //! \remarks only in local developer builds
+        virtual BlackMisc::CStatusMessageList debugVerifyStateAfterAllAircraftRemoved() const = 0;
+
         //! Is overall (swift) application shutting down
         virtual bool isShuttingDown() const = 0;
 
@@ -202,6 +209,9 @@ namespace BlackCore
         //! An airspace snapshot was handled
         void airspaceSnapshotHandled();
 
+        //! Relevant simulator messages to be explicitly displayed
+        void driverMessages(const BlackMisc::CStatusMessageList &messages);
+
     protected:
         //! Default constructor
         ISimulator(QObject *parent = nullptr);