Draft: waybar: initial configuration for the spin

The module text colors and underlines are optional and currently commented in the style. With these enabled, the bar could look like that:

Test builds: the usual place, https://copr.fedorainfracloud.org/coprs/g/sway-sig/sway-spin-dev/builds/

Fixes: ...er, a lot of issues, one rhbz and some direct mails. I think that's the most demanded configuration change for the spin.