Implement releasing of client-freed output
Summary:
Previously KWin supported only version 2 of wl_output interface
In third version there was an important addition that allowed clients to
unbind outputs they may previously have bound.
Bumping versions in both client and server part of KWayland to support
this behaviour.
Reviewers: davidedmundson, graesslin
Reviewed By: graesslin
Subscribers: jgrulich, Frameworks
Tags: Frameworks
Maniphest Tasks: T7785
Differential Revision: https://phabricator.kde.org/D10929