Add pinned windows which stick to the position when moving desktops

[andydotxyz]

Looking for a little feedback on naming and/or menu for this feature.
Adds "All desktops" to the "move to desktop" menu...

Does it "fit" for X11 and Wayland?

Checklist:

• Tests included.
• Lint and formatter run with no errors.
• Tests all pass.

[coveralls]

Pull Request Test Coverage Report for Build 9340301264

Details

• 0 of 24 (0.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.08%) to 28.602%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/ui/desk.go	0	1	0.0%
wm/border.go	0	23	0.0%

Files with Coverage Reduction	New Missed Lines	%
wm/border.go	1	0.0%

Totals
Change from base Build 9340251877:	-0.08%
Covered Lines:	1610
Relevant Lines:	5629

---

💛 - Coveralls

[andydotxyz]

Chat on slack seems to be that the naming is good. Let's see if this gets an approval though :)

[andydotxyz]

Merged on 7 day no-changes-requested default.