Implement niri support
Try to autodetect running compositor based on environment variables
XDG_SESSION_DESKTOP, XDG_CURRENT_DESKTOP, SWAYSOCK, NIRI_SOCKET in this order
Add the --compositor command line option
Add niri as optional dependency to the Arch Linux PKGBUILD
Update README and --help to include niri support
Merges the changes from
https://github.com/gergo-salyi/multibg-sway/pull/12
Thanks to the co-author for the contribution
Co-authored-by: Florian Finkernagel <finkernagel@imt.uni-marburg.de>