- Update to version 4.18.4
* Update copyright year
* Explicitly depend on gio-unix-2.0
* Replace deprecated xfce_spawn_command_line_on_screen()
* Add missing G_(BEGIN|END)_DECLS
* Add xapp for Wallpaper and Screenshot in xfce-portals.conf
* Add minimal xdg-desktop-portal conf file for Xfce (Fixes #181)
* Ensure all various XDG_* etc. env vars are passed to DBus and systemd
* Add missing export for XDG_CONFIG_HOME and XDG_CACHE_HOME
* Clean up SVG icon metadata for 24px, 48px actions
* Add action icons at 96px
* Add icons at missing sizes, clean up SVG metadata
* Translation Updates