Fancier icon-based workspace switcher

[fdev31]

WIP code, know problems:

• very dirty code, high chance of dead code etc... it's the first version I'm happy with after trying a lot of things
• chance of unneeded changes
• proper initialization / initial state is missing
• didn't test non-icons or vertical mode

Sorry for this PR ;)

[Axenide]

I'm testing this and the workspaces seem broken. I can almost see the elastic effect when using the default ones, but with a transparent color, or black, I don't really know. There is that primary colored thing that I assume is the elastic highlight?

[fdev31]

This version should be more robust

[fdev31]

I think it's broken after rebase, I've fixed it locally but will better test tomorrow.

[fdev31]

Please give it another try when you have time, it's really robust now, at least for me.

[fdev31]

When no label is used, it's not looking great (position are not matching the expectation). I suggest it could just be the same as the "icon" mode using " " as an icon, or something like this... I'm pushing a last commit to make things more consistent, but I didn't check anything vertical for now.

[fdev31]

Multi-monitor is still kind of broken but less than the current main branch in my case... I think it would require a bigger refactor regarding the event handling.