basic/string-util: add a convenience function to cescape mostly-ascii fields

It's not supposed to be the most efficient, but instead fast and simple to use.

I kept the logic in ellipsize_mem() to use unicode ellipsis even in non-unicode
locales. I'm not quite convinced things should be this way, especially that with
this patch it'd actually be simpler to always use "…" in unicode locale and "..."
otherwise, but Lennart wanted it this way for some reason.

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