##Early list of ideas/tasks:
* Our protocol extensions:
* number versioned: for example org_kde_kwin_outputdevice_v1
* shorten name: kde_outputdevice_v1
* xdg-shell:
* Drop ShellClient
* Drop XdgShellV5
* Rename XdgShell classes to match the spec used in V6/Stable rather than trying to retrofit into V5