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/SituationMapPlugin/Gui/SituationMap/layers_model.cpp

@@ -16,7 +16,7 @@ namespace SituationMap
 
 LayersModel::LayersModel(LtsSession::LtsSession *session, QObject *parent) : QAbstractTableModel(parent)
   , m_session(session),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 bool LayersModel::initModel(Map *situationMap)
 {