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/MeteoDataManagement/main_handler.cpp

@@ -22,7 +22,7 @@ MainHandler::MainHandler() : m_ddsHandler(nullptr)
   , m_handlerInfrastructureData(nullptr)
   , m_handlerStaticMeteoData(nullptr)
   , m_gnaService(nullptr),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
 } // end of ctor()
 //-----------------------------------------------------------------------------