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/OcBaseDownload/pdf_downloader.cpp

@@ -29,7 +29,7 @@ PdfDownloader::PdfDownloader(const QVector<WebSocketInterface::Messages::PdfList
   , m_exTblGen(new DBAdministration::ExerciseTableGenerator(getLogger("ExerciseTableGenerator"), NGL::directory(NGL::FileType::ConfigFile, QLatin1String("xml")), this))
   , m_downloadCount(0)
   , m_totalDownloads(pdfInfoVec.size()),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   connect(m_socket, &PdfDownloadSocket::downloadFinished,
           this, &PdfDownloader::onSingleDownloadFinished);
 }