New option: minimized window styling group

[tuurep]

I like the idea of visually distinguishing if a window is minimized (aka "iconified")

There was an open pull request on this in the original polywins repo, but it's now removed. If I recall it was not very complicated, though!

I have thought of two alternate ways:

1. just make a new config option minimized_window_fg_color (and possible bg and underline)
2. move minimized window to a separated area on the module, for example could look like this:
   • [ firefox · discord ] --- steam · gimp · mpv
     • minimized windows grouped on the left, and clicking on one would bring it back to the "main" area
   • steam · gimp · mpv --- [ firefox · discord ]
     • could be either side and configurable

Option 1. would be great, simple and understandable. I will probably do it.
Option 2. is a bit of a wild idea, I might not go for it, but it could be worth experimenting on.

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Problems:

• How to detect a window is minimized or not?
• Should this be a field on window_props, or give the window id to a function that will check if it's minimized before formatting for polybar?

[tuurep]

I'd actually enjoy if minimized windows would be their own module so that I could have them "move" to modules-left when the main module is in the middle:

See if that's possible, and if that makes sense to try.