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/Common/LtsPrinting/printing_base.cpp

@@ -63,7 +63,7 @@ Base::Base(QTextDocument &doc,
     itemFontSize_(2),
     m_settings(new NGL::Settings(NGL::findProjectConfigFile())).getNGLLogger("NGLPrinting")),
     m_currentPage(1),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger())
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger())
 {
     QString fn = _fn;
     fn = fn.remove(QLatin1Char(' '));