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/Timeline/Data/tln_data_plugin.cpp

@@ -29,7 +29,7 @@ std::shared_ptr<DataPluginBase::Interface> DataPlugin::createDataInterface(LtsSe
 DataInterfaceImpl::DataInterfaceImpl(LtsSession::LtsSessionDataDds *session)
   : DataInterface()
   , m_foreign(std::make_shared<ForeignInterfaceImpl>(session))
-  , m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger().getNGLLogger("Plugins.Timeline.Data"))
+  .getNGLLogger("Plugins.Timeline.Data"))
 {}
 
 ForeignInterfaceImpl::ForeignInterfaceImpl(LtsSession::LtsSessionDataDds *session)
@@ -37,7 +37,7 @@ ForeignInterfaceImpl::ForeignInterfaceImpl(LtsSession::LtsSessionDataDds *sessio
   , m_webSocketScm(nullptr)
   , m_webSocketEem(nullptr)
   , m_liveHistoryBufferTimer(new QTimer(this))
-  , m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger().getNGLLogger("Plugins.Timeline.Data"))
+  .getNGLLogger("Plugins.Timeline.Data"))
 {
   connect(m_liveHistoryBufferTimer, &QTimer::timeout, this, &ForeignInterfaceImpl::onClearHistoryBuffer);
   m_liveHistoryBufferTimer->setInterval(5000);
@@ -101,7 +101,7 @@ TimelineDataProvider::TimelineDataProvider(int requestId, const QUrl &url,
   , m_bFinshed(false)
   , m_requestMin(from)
   , m_requestMax(to)
-  , m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger().getNGLLogger("Plugins.Timeline.Data"))
+  .getNGLLogger("Plugins.Timeline.Data"))
 {
   connect(m_webSocketEem, &QWebSocket::disconnected,
           this, &TimelineDataProvider::disconnectedFromEem);