Specifically:
- Do not log exceptions to the same location data is output.
- Fix format, i3bar is no longer using “pseudo-JSON”, also not sure whether it
ever used format `[[right list], [left list]]`, but it definitely does not
now.
- i3bgbar branch is no longer available.
- Yet i3wm supports background color, just with the different key (`background`
vs `background_color`).