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/Plugins/Timeline/Gui/EventTimeline/tln_timeline_progress.cpp

@@ -17,7 +17,7 @@ namespace Timeline
 
 TimelineProgress::TimelineProgress( QWidget *parent ) : QWidget(parent)
   , m_ui(new Ui::TimelineProgress),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   m_ui->setupUi(this);
 
   setAttribute(Qt::WA_StyledBackground);