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/FeedGeoJson/feedGeoJson.cpp

@@ -20,7 +20,7 @@ namespace FeedGeoJson
 FeedGeoJson::FeedGeoJson(QObject *parent) : QObject(parent)
   , m_bTestsSuccessful(true)
   , m_refPos(LtsCoordTrans::UtmCoordinate::fromMgrs(QStringLiteral("32UMD8000090000"))),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 FeedGeoJson::~FeedGeoJson()
 {}