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/AreaEffectSimulation/object_base.h

@@ -129,10 +129,10 @@ class ObjectBase : public QObject
   static qint64 toMSec(const QDateTime &dt);
   template <typename T> dds::core::optional<T> toOptional(T inVal) { return inVal != T() ? dds::core::optional<T>(inVal) : dds::core::optional<T>(); }
 
-  dds::core::optional<qint64> toOptional(const QDateTime &dt)
+  dds::core::optional<int64_t> toOptional(const QDateTime &dt)
   {
     qint64 t = (dt.isValid() && !dt.isNull()) ? dt.toMSecsSinceEpoch() : 0;
-    return toOptional(t);
+    return toOptional<int64_t>(t);
   }
 
   template <typename T, typename U> static inline void ddsVecFromPoly(const T &in, const U &heights, std::vector<Core::GeoPosition> &out)