[WIP][ticket/12013] Use new dropdown for quickmod tools and jumpbox.

Depends on https://github.com/phpbb/phpbb/pull/1829 https://github.com/phpbb/phpbb/pull/1773 and another forthcoming PR.

http://tracker.phpbb.com/browse/PHPBB3-12013
http://tracker.phpbb.com/browse/PHPBB3-11392