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/GuezMinelayerProcessing/dds_handler.h

@@ -7,8 +7,10 @@
   */
 #pragma once
 
+#if BUILD_RTI
 #include <DDS/DDSConnector/dds_connector.h>
 #include <DDS/Core/topic_lock_master.h>
+#endif
 #include "logger.h"
 
 namespace GuezMinelayerProcessing
@@ -16,17 +18,25 @@ namespace GuezMinelayerProcessing
 class DdsHandler final
 {
 public:
+#if BUILD_RTI
   explicit DdsHandler(const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnector);
+#else
+  explicit DdsHandler();
+#endif
   ~DdsHandler() = default;
 
   bool init(const QStringList &qosFileList = QStringList());
 
+#if BUILD_RTI
   std::shared_ptr<DDSConnector::DdsConnector> ddsConnector() const { return m_ddsConnector; }
+#endif
   std::shared_ptr<Core::TopicLockMaster> topicLockMaster() const { return m_topicLockMaster; }
 
 private:
   NGL::INGLLogger &m_logger;
+#if BUILD_RTI
   std::shared_ptr<DDSConnector::DdsConnector>       m_ddsConnector;
+#endif
   std::shared_ptr<Core::TopicLockMaster>            m_topicLockMaster;
 };