Reflecting discussed changes for interpolation performance refs #386

(based on FSX testing)
* Only send changed situation to SIM
* Split sending of parts / situations
* Only send parts with a reduced frequency (means slower as positions)
* Mark geodetic height as null for default values (the value is usually unavailable)
* Fixed altitude to MSL for network data
* Trace which aircrafts support aircraft parts via network
* Renamed insert_fron push_front (as proposed by Roland)

Status quo / lessons learnt
* On slower PCs jitter is still noticed for interpolated aircraft.
* Running interpolation in an independent process (aka core, not in GUI) reduced load dependencies
  => it seems to make sense to run driver in own thread
* The onGround flag in parts seems clumsy as it required to retrieve parts for position updates
* In interpolation performance really matters

src/plugins/simulator/fsx/simconnect_datadefinition.h

@@ -70,13 +70,12 @@ namespace BlackSimPlugin
             char title[256]; //!< Aircraft model string
         };
 
-        //! Data struct of remote aircraft
-        struct DataDefinitionRemoteAircraft
+        //! Data struct of remote aircraft parts
+        struct DataDefinitionRemoteAircraftParts
         {
-            SIMCONNECT_DATA_INITPOSITION position;  //!< Aircrafts position
             double lightStrobe;                 //!< Is strobe light on?
             double lightLanding;                //!< Is landing light on?
-//            double lightTaxi;                   //!< Is taxi light on?
+            // double lightTaxi;                   //!< Is taxi light on?
             double lightBeacon;                 //!< Is beacon light on?
             double lightNav;                    //!< Is nav light on?
             double lightLogo;                   //!< Is logo light on?
@@ -141,7 +140,8 @@ namespace BlackSimPlugin
             {
                 DataOwnAircraft,
                 DataOwnAircraftTitle,
-                DataRemoteAircraft,
+                DataRemoteAircraftParts,
+                DataRemoteAircraftPosition,
                 DataSimEnvironment,
                 DataClientAreaSb,       //!< whole SB area
                 DataClientAreaSbIdent,  //!< ident single value