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/web_socket_server.cpp

@@ -26,7 +26,7 @@ WebSocketEventServer::WebSocketEventServer(const QSqlDatabase &db, QObject *pare
   , m_wsServer(nullptr)
   , m_cleanupTimer(new QTimer(this))
   , m_db(db),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   m_cleanupTimer->setInterval(10000); // clear every 10s
   connect(m_cleanupTimer, &QTimer::timeout, this, &WebSocketEventServer::onCleanupLiveHistory);
 }