The Horizon icon is based on preferences-wallpaper and preferences-system-login
from the fabulous Newaita-dark icon set, licensed CC-BY-NC-SA-3.0 and available
on the World Wide Web at: https://gitlab.com/cybernix/Newaita.

The status icons are from the Papirus icon theme, licensed GPL-3.0-only and
available on the World Wide Web at:
https://github.com/PapirusDevelopmentTeam/papirus-icon-theme.