fish_vi_cursor: add support for alternative foot terminfos

[dnkl]

Foot has several terminfos:

• foot - the default one
• foot-direct - 24-bit color terminfo, similar to xterm-direct (used by e.g. emacs)
• foot-extra - alternative to the ncurses provided terminfo, with a couple of extra, non-standard
  capabilities
• foot-extra-direct - 24-bit color version of the above

There may also be other distro-custom terminfo names (serving the same purpose as foot-extra*)

Related to issue #8391

TODOs:

• Changes to fish usage are reflected in user documentation/manpages.
• Tests have been added for regressions fixed
• User-visible changes noted in CHANGELOG.rst

[faho]

You probably want to touch

fish-shell/share/functions/__fish_config_interactive.fish

Line 261 in c553042

and test 0"$VTE_VERSION" -ge 3405 -o "$TERM_PROGRAM" = Apple_Terminal -a (string match -r '\d+' 0"$TERM_PROGRAM_VERSION") -ge 309 -o "$TERM_PROGRAM" = WezTerm -o "$TERM" = foot

as well. That's the only other spot we mention foot atm I can find.

[dnkl]

You probably want to touch

Done. However, I'm very unused to fish shell scripting... let me know if there's a better way to do this.

[faho]

Thank you very much, merged!