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/Proxies/TrainingAreaBase/Plugins/HlaJson/hla_handler_rx.cpp

@@ -14,7 +14,7 @@ HlaHandlerRx::HlaHandlerRx(const std::shared_ptr<TrainingAreaBase::RecvFromTab>
                            HlaDispatcher *dispatcher) : m_rxHandler(recvFromTabCb)
   , m_dispatcher(dispatcher)
   , m_bWarnedOnce(false),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 bool HlaHandlerRx::handleTelegram(const QByteArray &baJson)
 {