refs #395, turned remote aircraft provider interface into thread safe interfaces

* references gone, situations, parts, aircraft now as threadsafe copy
* read only interface gone (no longer references, so no longer needed)

src/blackcore/interpolator_linear.h

@@ -26,7 +26,7 @@ namespace BlackCore
     {
     public:
         //! Constructor
-        CInterpolatorLinear(BlackMisc::Simulation::IRemoteAircraftProviderReadOnly *provider, QObject *parent = nullptr) :
+        CInterpolatorLinear(BlackMisc::Simulation::IRemoteAircraftProvider *provider, QObject *parent = nullptr) :
             IInterpolator(provider, "CInterpolatorLinear", parent)
         {}