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_unit.cpp

@@ -23,7 +23,7 @@ HandlerMeteoDataUnit::HandlerMeteoDataUnit(MainHandler *mainHandler,
   , m_mainHandler(mainHandler)
   , m_asset(asset)
   , m_tcpWS(nullptr),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   init();
 } // end of ctor()
 //-----------------------------------------------------------------------------