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/Proxies/TrainingAreaBase/Plugins/DebugJsonDir/directory_cleaner.cpp

@@ -23,7 +23,7 @@ DirectoryCleaner::DirectoryCleaner(const QString &directory, unsigned int maxAge
   , m_cleanerThread(new QThread(this))
   , m_worker(new DirectoryCleanerWorker(directory, maxAgeSec))
   .getNGLLogger("TAB.Plugin.DirectoryCleaner")),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   QDir().mkpath(directory);
   doInitialCleanup(directory);
   m_worker->moveToThread(m_cleanerThread);