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/EffectShowClient/handler_vehicle.cpp

@@ -23,7 +23,7 @@ HandlerVehicle::HandlerVehicle(MainHandler *mainHandler,
   , m_mainHandler(mainHandler)
   , m_volleyTimer(new QTimer(this))
   , m_remainingTimer(new QTimer(this)),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   DEBUG_LOG(m_logger) << "HandlerVehicle ctor";
   m_volleyTimer->setSingleShot(true);
   m_remainingTimer->setInterval(1000);