Make fzf swappable

[AndydeCleyre]

Potential substitutes:

name	repo	last release	missing features
skim	https://github.com/lotabout/skim	2023	none, I think
gum	https://github.com/charmbracelet/gum	2024	--preview
pick	https://github.com/mptre/pick	2020	--preview? how does -d work with multiline descriptions?
peco	https://github.com/peco/peco	2023	--preview
heatseeker	https://github.com/rschmitt/heatseeker	2022	--preview

Rejected substitutes:

name	repo	last release
fzy	https://github.com/jhawthorn/fzy	2018
percol	https://github.com/mooz/percol	2015
happyfinder	https://github.com/hugows/hf	???
selecta	https://github.com/garybernhardt/selecta	2018
pmenu	https://github.com/sgtpep/pmenu	2017

• https://github.com/search?utf8=%E2%9C%93&q=slmenu&type=repositories

To look at still:

• https://github.com/Cloudef/bemenu
• https://github.com/mattn/gof
• https://github.com/dhamidi/tmenu
• https://github.com/smblott-github/tpick
• https://github.com/alanbork/ppick
• http://martanne.github.io/vis/man/vis-menu.1.html
• zsh native
• https://github.com/felipesere/icepick
• https://github.com/sulami/hmenu
• https://github.com/p-gen/smenu