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/audio_video_handler.cpp

@@ -49,7 +49,7 @@ public:
   const Streams &findStreams(Asset *asset) override
   {
     Q_ASSERT(asset);
-    return findStreams(asset->data().id());
+    return findStreams(asset->data().id);
   }
 
   void insert(Streams &streams) override
@@ -124,7 +124,7 @@ public:
   void remove(Asset *asset) override
   {
     Q_ASSERT(asset);
-    auto   found = m_cache.find(asset->data().id());
+    auto   found = m_cache.find(asset->data().id);
     Q_ASSERT(found != m_cache.end());
     const Streams   &streams = found->second;