Allow borderpx = 0

Toggle fullscreen on all clients

mod+e allows to toggle fullscreen any client, even those who don't
support it themselves

Handle new windows

Windows lose fullscreen state when a new window is created in the same
tag

isfullscreen int

Same fscreen func for xdg and xwayland

Fullscreen xwayland

Unlink fullscreen

Restore windows after fullscreen

Store position and size of windows before going fullscreen. This is more
efficient than arrange() and also works with floating windows

All the clients keep their original position because arrange() isn't
used after quitting fullscreen

No borders on fullscreen windows

Some code has been borrowed from the smartBorders patch

Toggle fullscreen

Basic fullscreen

set up interfaces in same order as sway

This makes it easier to compare WAYLAND_DEBUG logs when troubleshooting.

enable gamma control

cleanup function to match dwm

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