BUILD_RTI conditional fixes and Qt6 API updates

- cmake/FindRTI.cmake: Add INTERFACE placeholder targets when RTI not found
- cmake/FindRTI.cmake: Force BUILD_RTI=OFF when RTI not installed
- Lts/Common/LtsSession/CMakeLists.txt: Make LtsSessionDataDds conditional on BUILD_RTI
- Lts/Viewer/CMakeLists.txt: Make LtsDataView conditional on BUILD_RTI
- Lts/Plugins/*/CMakeLists.txt: 97 plugin files wrapped in BUILD_RTI conditionals
- cmake/NGLMacros.cmake: Fix NGL_ADD_BIG_RESOURCES macro (removed premature return())
- Multiple Qt6 API fixes: QLinkedList→std::list, QStringRef→QStringView, etc.
- BUILD_RTI_FIXES_SUMMARY.md: Comprehensive documentation of all fixes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/Common/situation_map_logging.h

@@ -0,0 +1,38 @@
+/**
+  * @RDE_HEADER@
+  * Logging within SituationMap
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+#include <NGLLogger/INGLLogger.h>
+#include "situation_map_common_export.h"
+
+class QUuid;
+
+namespace SituationMap
+{
+
+using LOGGER_T = NGL::INGLLogger&;
+
+// export for executables within 'Tests'
+LOGGER_T SITUATIONMAPCOMMON_EXPORT getLogger(const char *name, int id = -1);
+} // namespace SituationMap
+
+SITUATIONMAPCOMMON_EXPORT std::ostream &operator<< (std::ostream &stream,
+                                                    const QUuid &value);
+
+
+
+
+
+
+
+
+
+
+
+