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(bug 45568) propagate claim and label changes

Authored by daniel.

Description

(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