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/ExerciseEventManagement/handler_participant_event.cpp

@@ -26,7 +26,7 @@ HandlerParticipantEvent::HandlerParticipantEvent(MainHandler *mainHandler,
   , m_dbHandler(db)
   , m_eventServer(eventServer)
   , m_mainHandler(mainHandler),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
 } // end of ctor()
 //-----------------------------------------------------------------------------