WIP: Refactoring ideas collection

[JannikStreek]

Refactoring ideas

Frontend

• Mmp data types include non mmp related entities, like deletedAt => remove those from mmp types
• Change flow of application: Async request to create the map, then redirect to the map.
• Make a guard out of the admin id check in the gateway
• Make use of a transaction for updateMap call in mapService. Currently, existing nodes are deleted before the json is imported. Thats fine but should be wrapped inside a transaction block. Otherwise the import fails and the map is completly empty.
• Refactor file download logic, use window.URL.createObjectURL and try to to remove fakeLink, e.g. by using open

  public static downloadFile(name: string, content: string) {
    const fakeLink = document.createElement('a');

    const blob=new Blob([content]);
    const objectUrl = window.URL.createObjectURL(blob);

    fakeLink.href = objectUrl;
    fakeLink.download = name;

    document.body.appendChild(fakeLink);

    fakeLink.click();

    window.URL.revokeObjectURL(objectUrl)
    document.body.removeChild(fakeLink);
  }