Add an AFCH preference to turn off auto watchlisting

[NovemLinguae]

Reported by Significa liberdade and Vanderwaalforces in Discord

Steps to reproduce

• while logged out, create a draft with the template {{AfC submission}}. this will put it in a submitted state
• log in and visit the draft
• accept it

What happens?

• Article and article talk are watchlisted
• User talk message is not watchlisted

What should happen instead?

• Should add an AFCH preference to turn off auto watchlisting. If that preference is selected, then article and article talk do not get watchlisted

Notes

• This may be caused by the user's Special:Preferences. If so, the fix may be to read AFCH's watchlist preference, and if turned off, do an API query right after the accept to unwatchlist the two pages.

[MPGuy2824]

Setting the correct preference for the watchlist param while calling the edit api (https://www.mediawiki.org/wiki/API:Edit) should be enough.

[zanhecht]

I submitted pull request #300 for a patch which adds a "Do not add pages to watchlist" preference. When that preference is checked, it adds "watchlist: 'nochange'" to all the edit and move requests made by the script. It also makes it so the script never adds [[Wikipedia:Articles for creation/recent]] to the watchlist, since there is no value in doing so each time a draft is approved.