Sway provides the workspace "num" property which is an integer number of
the workspace, i.e., workspace "3" -> 3 and also "3dev" -> "3". This
commit uses this property to sort the workspaces, which makes sense when
persistent workspaces or all-output is specified. This commit also adds
a new configuration option, whether the numeric workspaces come in front
or after workspaces that have non-numeric name.
All workspace buttons that are visible on the same output as the current waybar can be styled with the `current_output` css class.
This is really only useful in combination with the `"all-outputs":
true`. Then the workspaces that are on the current output can be styled
differently than the workspace on other outputs, while all are visible
in the waybar.
Michael Rodler
Alex
Birger Schacht
Michael Aquilina