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/default_av_menus.cpp

@@ -76,7 +76,7 @@ DefaultAvMenus::DefaultAvMenus(const ExerciseContext &context, Interface::Dts *d
   , m_ismDtc(ismDtc)
   , m_timer(new QTimer)
   , m_isInitialized(false),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   Q_ASSERT(dts);
   Q_ASSERT(ismDtc);
   if(!m_ismDtc->isMainStructureElementEnabled())