fix usage to match

we're not really using the log

this is technically barf too I guess?

only call updatewindowtype for x11 windows

handle NULL return from backend_autocreate

Fixes #44.

add macro for fatal errors

dwm lets the OS do cleanup if the program errors out

Use SIGCHLD handler from dwm

Fixes #46.

make this marginally less ugly

wlr_session_change_vt is NULL safe

_net_wm not needed outside xwayland

add comment from dwm

Merge branch 'shcmd' of https://github.com/guidocella/dwl into master

Merge pull request #37 from alex-courtis/31-independents-mouse-focus

31 independents mouse focus

Merge pull request #41 from guidocella/declare-commitnotify

Declare commitnotify

Declare commitnotify

make rule examples a comment

Merge pull request #40 from guidocella/firefox-class

Fix Firefox class

Fix Firefox class

Merge branch 'master' into 31-independents-mouse-focus

make XWayland support optional