[xmonad] kill -STOP/-CONT hack

[vrs]

Quoting Brandon Allbery (2016-03-10 18:39:01)
> http://hackage.haskell.org/package/xmonad-contrib-0.12/docs/XMonad-Layout-Stoppable.html

FWIW, I have considered using this but eventually just wrote a script
that makes for less surprising behavior:
https://gist.github.com/anonymous/a89fbe442b71cbda2b40
It should be easy enough to translate it into bassh (the only
zsh-specific syntax in there is in line 44).
Dependencies are pgrep, xprop and xclip.
Usage: bind to a key and use to stop the process that spawned a window
(hopefully anyway: not all applications play well when it comes to
_NET_WM_PID).
It's a bit rough around the edges but works for me (firejail broke
something about it though that I still need to fix).

-vrs