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_avs.cpp

@@ -66,7 +66,7 @@ WebSocketAvs::WebSocketAvs(MainHandler *mainHandler,
   , m_exerciseId(exerciseId)
   , m_lastUpdate(0)
   , m_bWebSocketDisconnectedWarnedOnce(false),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   connect(m_wsReconnectTimer, &QTimer::timeout,
           this, &WebSocketAvs::openWebSocket);