Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  1ffb6a1eb061bcf12c971a242d8c1112c06766ce
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Re-apply "Added EntityId and EntityIdParser in JS"

The new data value is not yet in use, this will be done in a follow up which will also include all
necessary fixes for the UI.

patch set 4: rebase
patch set 6: don't use new data value type in production yet, do this as a follow-up

Change-Id: I0ffafe2b040f40715dfa03c529ece81b1e2d9d0b