Add XDG Output Protocol
Summary: Done primarily for XWayland which for legacy reasons doesn't assume the logical size of a display is pixelSize / outputScale. Meaning xwayland windows that position themselves are wrong in a scaled environment. It also allows the possibility for us to support fractional scaling whilst keeping wl_output::scale as an integer. The protocol is a bit odd as it operates via the FooManager + Foo pattern rather than using globals like Output so I've wrapped it so it behaves more like globals. Test Plan: #plasma Reviewers: romangg Subscribers: #frameworks Tags: #frameworks Maniphest Tasks: T8501 Differential Revision: https://phabricator.kde.org/D12235
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8da9a184
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