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/TrainingAreaBaseOC/ttci_channel.cpp

@@ -14,7 +14,7 @@ Channel::Channel(QChar channel, bool bIsBinary, QObject *parent) : QObject(paren
   , m_bIsBinary(bIsBinary)
   , m_device(nullptr)
   .getNGLLogger("SCTT.Channel")),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {}
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
 
 void Channel::setDevice(Device *dev)
 {