x11-wm/wlmaker: add new port

A Wayland compositor inspired by Window Maker.

Key features:

* Compositor for windows in stacking mode.
* Supports multiple workspaces.
* Appearance inspired by Window Maker, following the look and feel of NeXTSTEP.
* Easy to use, lightweight, low gimmicks and fast.
* Dock and clip, to be extended for dockable apps.

Wayland Maker is in early development stage. For existing and planned features
see https://github.com/phkaeser/wlmaker/blob/main/doc/ROADMAP.md