refs #444 Use CAircraftMatcher to match a model and send it to xbus

In case the model name is empty, xbus falls back to its former
behaviour and lets libxplanemp do the matching. If aircraft matcher
does provide a model this will be used instead.
Until model mapping database is ready, a dummy provider has been added.
Hence CAircraftMatcher will always return a default model.

src/blackmisc/simulation/modelmappingsprovider.h

@@ -42,6 +42,20 @@ namespace BlackMisc
         protected:
             BlackMisc::Network::CAircraftMappingList m_mappings; //!< Mappings
         };
+
+        //! Model mappings dummy
+        class BLACKMISC_EXPORT CModelMappingsProviderDummy : public IModelMappingsProvider
+        {
+        public:
+            //! Constructor
+            CModelMappingsProviderDummy(QObject *parent = nullptr) : IModelMappingsProvider(parent) {}
+
+            //! Destructor
+            virtual ~CModelMappingsProviderDummy() {}
+
+            //! Load data
+            virtual bool read() override { return true; }
+        };
     } // ns
 } // ns