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/Common/LtsTimelineClassic/main.cpp

@@ -20,7 +20,7 @@ void add(qint64 time_offset)
     time += time_offset;
 
     ttm->addTestEvent(new LtsTimelineClassic::Event(
-        0, (int)ProjectDataManagement::PdmEventType_def::Hit, time, 0, 0, 0, 0, QStringList() << QStringLiteral("Test"),
+        0, (int)ProjectDataManagement::PdmEventType::EventType_Hit, time, 0, 0, 0, 0, QStringList() << QStringLiteral("Test"),
         LtsTimelineClassic::Event::drawCustomEventGraphicEllipse, QColor("green"), QString()));
 }