Discussion: remove gs/gS altogether in favour of omni_gs

[ggandor]

I liked the idea of unidirectional window scanning at first, but usually there are two split windows at most, and in that case it's plain annoyance to have two commands when all I want to say is "go to the other one". (You can leave e.g. thumbs up/down reactions if you have nothing more to add, just would be okay with the deprecation/removal, or against it, that is also helpful.)