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/RoutingServiceNG/session.cpp

@@ -9,11 +9,12 @@
 
 #include "session.h"
 
+#if BUILD_RTI
 namespace RoutingService
 {
 Session::Session(const QString &partitionNameSv, const QString &partitionNameWs) : m_partitionNameSv(partitionNameSv.toStdString())
   , m_partitionNameWs(partitionNameWs.toStdString()),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 Session::~Session()
 {
@@ -54,3 +55,4 @@ void Session::shutdown()
 
 
 } // namespace RoutingService
+#endif // BUILD_RTI