Adding form_id to comment creates and edits.

Adding form_id to comment creates and edits.

- This adds a form_id to CreateComment, EditComment, and CommentResponse
- This is so any front end clients can add a randomly generated string,
  and know which comment they submitted, is the one they're getting
  back.
- This gets rid of all the weird complicated logic in handleFinished(),
  and should stop the comment forms getting cleared once and for all.