Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  349f177a8e13a8ebfd077422ed830e97cbdad0ef

(bug 45568) propagate claim and label changes

In order to allow dispatch and handling of more types
of changes, ChangeHandler and related classes needed
some refactoring. All functionality related to handling
changes on the client side has been consolitated in
ChangeHandler.

Change-Id: I8deaf8e2b5d1e5efe56f439f3bba2693eb0bfb11