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/TetraIF/PrtCnv/PrtCnvRadioThread.cpp

@@ -90,7 +90,7 @@ PrtCnvRadioThread::PrtCnvRadioThread(int exerciseId, PrtCnvThreadStarter *a_pare
       m_bUseScrambling(false),
       m_loggerStats(getLogger("PrtCnvRadioThread.statistic")),
       m_exerciseEquipmentAssignmentMutex(QMutex::Recursive),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
     m_Name = QStringLiteral("Radio");
     for (int i = 0; i < AVERAGE_COUNT; ++i)
     {