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/AudioVideoManagement/object_menu_struct.cpp

@@ -77,7 +77,7 @@ namespace AudioVideoManagement
 
 ObjectMenuStruct::ObjectMenuStruct(Interface::Dts *dts, DatabaseInterface *db) : m_dts(dts)
   , m_db(db),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   Q_ASSERT(dts);
   Q_ASSERT(db);
 }