These were reported privately to me by Federico Bruni.

Includes new languages and new compression types.

Also, check that the decompression program exists before trying to use it.

Fix problem reported at
https://lists.gnu.org/archive/html/lilypond-user-fr/2022-04/msg00075.html

Then update the autogenerated result.

This enriches the space of recognized builtins.

Note that this also fixes the space after a builtin being included in
the token.

- Add pitch language names to builtins.  They are not highlighted
  specially in the default style, but can be in a custom style.

- Refactor matching of builtins in order to avoid confusion between
  dim chord modifier and \dim dynamic command.

- Support grob subproperties.

- Add segno repeat type.

- While at it, update builtins for latest version.

* LilyPond: update builtins to 2.23.4

* Doc: deduplicate LilyPond in language lists

* Doc: exclude lilypond style from gallery

Because it's specific to LilyPond code and doesn't give good results
on Python code.