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/Buildings/BuildingControlUnit/VWM/test_read_xml.cpp

@@ -15,7 +15,7 @@
 
 Test::Test() : m_api(new BuildingControlUnit::VWM::Api(this))
   .getNGLLogger("BCU.VWM.Test")),
-    m_logger(NGL::NGLLoggerBootstrap::getLogger()) {
+    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
   connect(m_api, &BuildingControlUnit::VWM::Api::hitResult,
           this, &Test::hitResult);
   QTimer::singleShot(0, this, &Test::test1);