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/connection_handler_tcp_ttci.cpp

@@ -20,7 +20,7 @@ ConnectionHandlerTcpTtci::ConnectionHandlerTcpTtci() : m_messageDataStart(true)
   , m_segmentToggle(0)
   , m_canDevice(new Device(this))
   , m_canChannel(new Channel(QLatin1Char('@'), true, this)),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   connect(m_canChannel, &Channel::dataAvailable, this, &ConnectionHandlerTcpTtci::slotReadCanFrame);
   connect(m_canChannel, &Channel::disconnectedFromEq, this, &ConnectionHandlerTcpTtci::disconnectedFromEq);
 }