Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  3786c1c9d80460d3212377709e9040d2904be85b
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Add needsToken(), mustBePosted() and isWriteMode()

This is mostly kitchen sink stuff that should be part of the
modules to block abuse.

Change-Id: I827844503147b36825a4b3615a4b47950af773ad