text: Title: More user information should be included in user mode scoreboard export
  Body: User mode scoreboard CSV exports are missing the user IDs as well as user emails. 
  
  https://github.com/CTFd/CTFd/blob/2c32791c241cd9ee6bb3183ed2221154e70a927f/CTFd/utils/csv/__init__.py#L117-L126