Show all past submitters in "Submit" dropdown suggestions

To do this, we store all submitters in a new afchSubmission.submitters
array generated at parse.
Remove postpone G13 templates on accept
Style: avoid label wrap on accept
Add G13 functionality :D

If a submission is eligible, we show a “Request G13 deletion” button in
the main panel. When clicked, the script will add {{db-g13}} to the
submission and notify the page creator as well as all users who have
submitted the page for review in the past. After notifying, we log the
G13’ing for good measure to the user’s CSD log.

- AFCH.dateToMwTimestamp() function added to core
Improve malformed ref handling

More stable regex with fewer false positives; wrap content of <pre>
tags.