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/Services/AudioVideoManagement/exercises_handler.cpp

@@ -115,7 +115,7 @@ void ExercisesHandler::onExerciseChanged(const ExerciseManagement::Exercise &dat
   {
   case DataModification::eAdded:
   case DataModification::eModified:
-    exerciseModified(data.id(), data.state());
+    exerciseModified(data.id, data.state);
     break;
   case DataModification::eRemoved:
     // nothing to do here