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/Plugins/PresentationManagement/Gui/Script/Common/ScriptChooser/script_chooser.h

@@ -3,11 +3,11 @@
 
 #pragma once
 
-#include <Lts/Plugins/PresentationManagement/Gui/Script/Common/preguiscriptcommon_export.h>
+#include <preguiscriptcommon_export.h>
 #include <Plugins/PresentationManagement/pre_data_plugin_interface.h>
 #include <Services/OperatorManagement/opm_dtc.h>
 #include <LtsWidgets/lts_frameless_dialog.h>
-#include <LtsUtilsGuiDds/request_helper.h>
+#include <LtsUtils/LtsUtilsGui/LtsUtilsGuiDds/request_helper.h>
 #include <Services/PresentationManagement/pre_ftc.h>
 #include <QDialog>