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/Proxies/TrainingAreaBase/ppm_handler.h

@@ -2,7 +2,10 @@
 
 #pragma once
 
+#include <QtCore/QObject>
 #include <ParticipantManagement/ppm.hpp>
+#include <ParticipantManagement/ppm_dtc.h>
+#include <LtsUtils/LtsUtilsCore/data_modification_enum.h>
 #include <unordered_map>
 #include <unordered_set>
 #include "logger.h"