fzf support

It would be great if dialog were optional and fzf would be accepted as well.

dialog is already used in the installer, and one of the main targets for this is being part of the liveusb/installer
fzf seems to have a different paradigm for interaction than dialog, so it would probably not work well to support both
(less of a concern now but) fzf has some issues on big-endian systems
I don't know much about using fzf, but i'd maybe accept a PR to switch to it at a later date (like, after release), if it could work well

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