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/ServiceManagement/service_process.cpp

@@ -33,7 +33,7 @@ ServiceManagement::ServiceProcess::ServiceProcess(const GroupRequest &groupData,
   , m_failedStartAttemptCounter(0)
   , m_stoppedFromRequest(false)
   , m_pidProc(new QProcess(this)),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   QStringList args({QStringLiteral("-e"), QString::number(m_groupData.exercisePartitionId()),
                     QStringLiteral("-d"), QString::number(m_groupData.domainId())});