Make fast position update settings persistent

Instead of enabling fast position updates via context methods, the
settings API will be used instead. This also allowed to move the timer
into CNetworkVatlib instead of CAirspaceMonitor. The only necessary thing
was to regularly update the receiver callsign set.

refs #677

src/blackcore/airspacemonitor.h

@@ -190,12 +190,6 @@ namespace BlackCore
             std::function<void(const BlackMisc::Simulation::CAirspaceAircraftSnapshot &)> aircraftSnapshotSlot
         ) override;
 
-        //! Is interim position sending enabled?
-        bool isFastPositionSendingEnabled() const;
-
-        //! Enable interim position sending
-        void enableFastPositionSending(bool enable);
-
         //! Analyzer
         CAirspaceAnalyzer *analyzer() const { return m_analyzer; }
 
@@ -254,9 +248,7 @@ namespace BlackCore
         CAirspaceAnalyzer     *m_analyzer                = nullptr; //!< owned analyzer
         bool                   m_serverSupportsNameQuery = false;   //!< not all servers support name query
         bool                   m_connected               = false;   //!< retrieve data
-        bool                   m_sendInterimPositions    = false;   //!< send interim positions to other clients
         bool                   m_logMatchingProcess      = false;   //!< shall we log. information about the matching process
-        QTimer                 m_interimPositionUpdateTimer;
 
         // locks
         mutable QReadWriteLock m_lockSituations; //!< lock for situations
@@ -320,7 +312,7 @@ namespace BlackCore
         void ps_receivedDataFile();
         void ps_aircraftConfigReceived(const BlackMisc::Aviation::CCallsign &callsign, const QJsonObject &jsonObject, bool isFull);
         void ps_aircraftInterimUpdateReceived(const BlackMisc::Aviation::CAircraftSituation &situation);
-        void ps_sendInterimPositions();
+
     };
 
 } // namespace