Automatically install/remove/update related refs

Summary:
Process related refs which should be automatically installed/remove/updated together with the
app or runtime which is being processed. This is mostly localization, but in case of runtime it
can automatically download styles, icons and so on.

Reviewers: apol

Reviewed By: apol

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D6677