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* Support wlroots 0.15
The latest release of wlroots brings with it a new scene graph API as well
as changes to the backend and renderer interfaces, all of which should make
it much easier to do proper handling of rendering and damage tracking, as
well as simplify some of the handling that was needed for showing windows
in the outputs. There are also minor changes to the handling of boxes,
surfaces, and other wlroots primitives. The basic tiny compositor is updated
with some of this functionality, but expect further pywlroots releases to
make use of all the wlroots 0.15 features
* Additional breaking changes: Python 3.6 has hit EOL, so this version is no
longer supported.