Updated mediawiki/extensions
Project: mediawiki/extensions/SemanticDrilldown  ef37d6690a0cbbdaae269b7caaa66eda188375e9

Filter pages deprecated, replaced by #drilldowninfo parser function

All SD "special properties" like "Has filter" and "Covers property" have
been deprecated as well; and the files and messages for filter creation,
like Special:CreateFilter, have all been removed. This is a big change!

Change-Id: I584dbd4cbdffaa9a58e11724c6387d1e01c969cb