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/connection.cpp

@@ -10,6 +10,7 @@
 #include "connection.h"
 #include "data_writer_task.h"
 
+#if BUILD_RTI
 #include <QCoreApplication>
 #include <QElapsedTimer>
 
@@ -31,7 +32,7 @@ Connection::Connection(const dds::domain::DomainParticipant &domainParticipant,
   , m_topicsToRoute(topicsToRoute)
   , m_partition(partition)
   , m_description(desc),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   INFO_LOG(m_logger) << "Create connection: " << partition
                      << ", domain: " << domainParticipant.domain_id()
                      << ", direction: " << m_description
@@ -184,3 +185,4 @@ bool Connection::initTopics()
 }
 
 } // namespace RoutingService
+#endif // BUILD_RTI