Load P3D 64 bit SimConnect shared library at runtime

This aligns the behavior and concept with the 32 bit FSX version. SimConnect
is loaded at runtime, depending on the version being selected.
It also adds a featuren to change the P3D SimConnect version at runtime by
unloading the previous and loading a new one.

ref T349

src/plugins/simulator/p3d/simulatorp3d.h

@@ -42,6 +42,11 @@ namespace BlackSimPlugin
                           BlackMisc::Network::IClientProvider *clientProvider,
                           QObject *parent = nullptr);
 
+            //! \name ISimulator implementations
+            //! @{
+            virtual bool connectTo() override;
+            //! @}
+
 #ifdef Q_OS_WIN64
             //! \copydoc BlackMisc::Simulation::ISimulationEnvironmentProvider::requestElevation
             virtual bool requestElevation(const BlackMisc::Geo::ICoordinateGeodetic &reference, const BlackMisc::Aviation::CCallsign &callsign) override;
@@ -78,6 +83,9 @@ namespace BlackSimPlugin
         public:
             //! Constructor
             using CSimulatorFsxCommonListener::CSimulatorFsxCommonListener;
+
+        protected:
+            virtual void startImpl() override;
         };
     } // ns
 } // ns