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/Plugins/MarkerManagement/Gui/MarkerEdit/mrk_set_markers.cpp

@@ -62,7 +62,7 @@ bool containsStream(QComboBox *cb, const QString &internalStreamName)
 namespace MarkerManagement
 {
 FinishedSignal::FinishedSignal() : QObject(),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 
 SetMarkers::SetMarkers(LtsSession::LtsSession *session, QWidget *parent)