Updated mediawiki/extensions
Project: mediawiki/extensions/WikibaseQueryEngine  2863cb9783ee32b0c18e115f17dbeea5e618e4fd

Added some docs and TODO

Change-Id: Iad0be8365331daa96b24501302a44e4783b7c349

Move PropertyDataValueTypeLookup out of SQLStore NS

Change-Id: I1e9f214a1635eb3a70b565293b8a406c0f5cbb5b