Updated mediawiki/extensions
Project: mediawiki/extensions/BetaFeatures  3fa0061755cbfea331a052f6b39a161b4854f020

Use the new feature field

Removes all of the in-extension stuff and the special page, adds a
preference section for beta features and uses that instead.

Also has two new field classes that *should* be in core. But I've put
them in the extension for now because core doesn't want the checkbox
redesign just yet.

Change-Id: Ie2c959760be50d8b8068b1544aa722d55d2a773c