Qt6 Migration: BUILD_RTI guards und CMake fixes

- BUILD_RTI conditional compilation für RTI Connext DDS dependencies
- Namespace fixes in core_dtc.h (Core:: → DDS::Core::)
- CMakeLists.txt: BUILD_RTI option und conditional dependencies
- Handler minelayer: namespace closing mit BUILD_RTI guard
- Build erfolgreich mit BUILD_RTI=OFF validiert

Signed-off-by: Torsten Wierschin <torsten.wierschin@life-maps.com>

qt6-after/qt6-migrated-legatus/Lts/Services/RoutingServiceNG/session.h

@@ -9,7 +9,10 @@
 #pragma once
 
 #include <string>
+#include <QString>
+#if BUILD_RTI
 #include "connection.h"
+#endif
 
 namespace RoutingService
 {
@@ -19,17 +22,21 @@ public:
   explicit Session(const QString &partitionNameSv, const QString &partitionNameWs);
   ~Session();
 
+#if BUILD_RTI
   bool init(const dds::domain::DomainParticipant &dpIn,
             const dds::domain::DomainParticipant &dpOut,
             const std::vector<TopicDispatcherInterface *> &topicsToRouteToWs,
             const std::vector<TopicDispatcherInterface *> &topicsToRouteToSv);
   void shutdown();
+#endif
 
 private:
   NGL::INGLLogger &m_logger;
   std::string m_partitionNameSv;
   std::string m_partitionNameWs;
+#if BUILD_RTI
   std::unique_ptr<Connection> m_connectionSvToWs;
   std::unique_ptr<Connection> m_connectionWsToSv;
+#endif
 };
 } // namespace RoutingService