Migrates residual Lts sources to generated rtiddsgen API

Adds NmeaManagement tests, fixes codegen includes and Qt6 SerialPort CMake target.

qt6-after/qt6-migrated-legatus/Lts/Plugins/SituationReplay/Gui/ReplayControl/replay_control_widget.cpp

@@ -535,7 +535,7 @@ void SituationReplayControlWidget::onMarkerClicked(const QModelIndex &index)
       for (const MarkerManagement::MarkerDescription &desc : std::as_const(descriptionsRef))
         markerTypes.append(desc.markerType());
 
-      if (markerTypes.contains(MarkerManagement::MarkerType_def::Situation))
+      if (markerTypes.contains(MarkerManagement::MarkerType::Situation))
         m_sitMapGuiIfc->setCenterPoint(QPointF(marker.position().lon(), marker.position().lat()));
     }
   }