xfwm4: assisted tiling feature

[Björn Fischer]

Hi Oliver,

>> with my newly aquired fork privileges I pushed a first roughly 
>> working version of that feature into this branch:
[...]
> Just a quick note, eventually you'd need to post a „merge request“
> of your local branch to the master branch - If it is not ready, just 
> mark it as „Draft“ in gitlab.

the patch set in it's current form could not be considered as "draft",
not even close. I'd call it a half-baked idea. Still ok to create a pull
request?

Cheers,
Björn