Pywlroots

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* Add keyboard destroyed property
* Add texture handling functionality
* Add server decoration manager

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* Changed versioning scheme: Releases will be versioned where the major and
minor version of pywlroots will match the version of wlroots that is supported.
The patch version of pywlroots will be incremented for various additions,
changes, and bug fix versions to support the designated wlroots version.
* Bug fix for ``set_custom_mode``

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* Add wlr output managment

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* Add output damage tracking functionality.

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* Add some more wlroots interfaces and modify the API for creating Compositors
and associated Backend and Renderer objects.

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* Add check to see if a surface is an XDG surface, and check it before returning
the surface.