Adapts shared tests and common code to generated rtiddsgen API

Updates test suites and Lts/Common consumers to plain member access.

qt6-after/qt6-migrated-legatus/Lts/Common/LtsPluginManager/lts_plugin_loader.cpp

@@ -293,7 +293,9 @@ bool LtsPluginLoader::loadPlugins(PluginType requestedPluginType,
     }
 
     const QString jsonIid = iid.value().toString().toLower(); // LOWERCASE ! (pun intended)
-    const QVector<QStringRef> iidParameters = jsonIid.splitRef(QLatin1Char(':'));
+    // Qt6: QStringRef/QString::splitRef were removed; QStringView::split
+    // provides the same zero-copy tokenization.
+    const QList<QStringView> iidParameters = QStringView{jsonIid}.split(QLatin1Char(':'));
 
     DEBUG_LOG(logger) << "Plugin " << absoluteFilePath << " provides iid '" << jsonIid;