message: add clear Asset to avoid light caching problem
diff: @@ -1195,6 +1195,9 @@ void MainWindow::buildMainMenuFile()
  frame->remove("world");
  lightsManager->clear();
  + // TODO: lights caching to avoid complete re-importing after clearing
  + sg::clearAssets();
  +
  // Recreate MaterialRegistry, clearing old registry and all materials
  baseMaterialRegistry = sg::createNodeAs<sg::MaterialRegistry>(
  "baseMaterialRegistry", "materialRegistry");
  