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/handler_meteo_data_units.cpp

@@ -15,7 +15,7 @@ namespace MeteoDataManagement
 {
 
 HandlerMeteoDataUnits::HandlerMeteoDataUnits(MainHandler *mainHandler) : m_mainHandler(mainHandler),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
 } // end of ctor()
 //-----------------------------------------------------------------------------