message: load html legacy projects as well
diff: +import migrateProject from "./legacy/migrate";
  const browser = window.browser;
  export function saveProject(project) {
  @@ -33,6 +34,8 @@ export function loadProject(project, file) {
  fileReader.onload = (e) => {
  if (file.type === "application/json") {
  loadJSONProject(project, e.target.result);
  + } else if (file.type === "text/html") {
  + project.fromJS(migrateProject(e.target.result));
  }
  };
  