xfwm4-wayland: wlroots branch merged into wayland branch

The wlroots version of xfwm4-wayland now has partial support for the
wlr-foreign-toplevel protocol.

I have now declared feature parity with the libweston version, so I
have merged the wlroots branch into the wayland branch.

Link to the git repository:
https://github.com/adlocode/xfwm4/tree/wayland

Regards
adlo