Cycles through all avaiable layouts using MOD-CTRL-, and MOD-CTRL-.
This adds a "NULL, NULL" layout at the end of the list, which should always be the last layout in your list.
This is probably only "useful" if you are using a lot of layouts.
Inspired by this post.
Hopefully whoever wanted this sees it and no longer has to duplicate functions.
- dwm-cyclelayouts-20180524-6.2.diff (2018-05-24)