refs #863 Each aircraft gets its own interpolator instance,

so each one can cache calculations from one frame to the next.
The recent situations and parts are members of the interpolator.

src/plugins/simulator/fsx/simconnectobject.h

@@ -43,6 +43,9 @@ namespace BlackSimPlugin
             //! Simulated aircraft model string
             const QString &getAircraftModelString() const { return m_aircraft.getModelString(); }
 
+            //! Interpolator
+            BlackMisc::Simulation::IInterpolator *getInterpolator() const { return m_interpolator.data(); }
+
             //! Get current lights (requested from simulator)
             const BlackMisc::Aviation::CAircraftLights &getCurrentLightsInSimulator() const { return m_currentLightsInSim; }
 
@@ -119,6 +122,7 @@ namespace BlackSimPlugin
             BlackMisc::Aviation::CAircraftLights m_currentLightsInSim { nullptr }; //!< current lights to know state for toggling
             BlackMisc::Aviation::CAircraftLights m_lightsAsSent { nullptr };       //!< lights as sent to simulator
             SIMCONNECT_PERIOD m_requestSimDataPeriod = SIMCONNECT_PERIOD_NEVER;    //!< how often do we query ground elevation
+            QSharedPointer<BlackMisc::Simulation::IInterpolator> m_interpolator;   //!< shared pointer because CSimConnectObject can be copied
         };
 
         //! Simulator objects (aka AI aircraft)