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/HighLevelArchitecture/Guez/ngs_connector.cpp

@@ -154,7 +154,7 @@ NgsConnector::NgsConnector(const QString &fedName, NgsHandler *ngsHandler) : m_n
   , m_bInitialized(false)
   , m_bCanPublishData(false)
   , m_timer(new QTimer(this)),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   connect(m_timer, &QTimer::timeout,
           this, &NgsConnector::go);
   connect(m_playerCallback, &PlayerCallback::firstTick,