* Handle using xrandr to --auto/--off displays as appropriate.
* Provide some sort of eventing mechanism to update i3 configs as well.
* Only allow an output to be considered as one screen to allow, e.g.,
```
	screens:
		internal:
			output: eDP-1-1
		hdmi_primary:
			output:
				- HDMI-1-1
				- HDMI-1-2
		hdmi_secondary:
			output:
				- HDMI-1-2
				- HDMI-1-1
```
  This would allow creating a layout for "one monitor connected to either port"
  and one for "both ports connected".