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/Plugins/BuildingViewer/Common/bdv_dds_controller.cpp

@@ -36,7 +36,7 @@ static inline QString gStrSymbolFolderPath()
 
 BuildingViewerDdsController::BuildingViewerDdsController(CommunicationInterfaceInternal* connection,
                                                          VCtrl::ViewerInterface* viewerInterface)
-    : m_connection(connection), m_viewerInterface(viewerInterface), m_logger(NGL::NGLLoggerBootstrap::getLogger())
+    : m_connection(connection), m_viewerInterface(viewerInterface), m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger())
 {
 }