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/AreaEffectSimulation/dds_handler.cpp

@@ -21,7 +21,7 @@ namespace AreaEffectSimulation
 DdsHandler::DdsHandler(int domainId, int exerciseId, QObject *parent) : QObject(parent)
   , m_ddsConnector(std::make_shared<DDSConnector::DdsConnector>(domainId, IDL::PartitionType::Exercise, exerciseId))
   , m_currentTimeMSec(-1),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   DEBUG_LOG(m_logger) << "DdsHandler(" << domainId << ") for partition: " << m_ddsConnector->getDefaultPartition();
 }