Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  4a2257a7d63e5ec2e01ce9fc8b48a365e6939538

Extract handlers for ParserOutput hooks

This factors the handlers for ParserOutput related hooks
out of the general WikibaseCLientHooks class into a separate class
and makes them testable.

Change-Id: I5a76107fb9e02c94d75205738858a57b1175ac56