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/FileManagement/pdf_server.cpp

@@ -18,7 +18,7 @@ namespace FileManagement
 {
 PdfServer::PdfServer(MainHandler *mainHandler, QObject *parent) : QObject(parent)
   , m_tcpServer(TcpServer::instance(NGL::Connections::port(NGL::Connections::eConnection::FLM_PDF_SERVER))),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   m_tcpServer->setUserData(mainHandler);
   m_tcpServer->setUseWorkerThreads(false);
 }