(texinfo-environments, texinfo-environment-regexp): Hoisted.

(texinfo-environments, texinfo-environment-regexp): Hoisted.
(texinfo-font-lock-keywords): Use `italic' and `bold' faces.
Only highlight the menu name in menu items.
Setup `@foo ... @end foo' as text clones.
(texinfo-clone-environment): New function.
(texinfo-mode): Simplify auto-fill-inhibit-regexp.
(texinfo-insert-block): Simplify.
(texinfo-insert-quote): Insert a plain " if preceded by \ or if
the command is repeated.
(texinfo-last-unended-begin, texinfo-next-unmatched-end): New funs.
(texinfo-insert-@end): Simplify.