(texinfo-font-lock-syntactic-keywords):

(texinfo-font-lock-syntactic-keywords):
Add regexp for @ignore ... @end ignore.
(texinfo-heading-face): New face.
(texinfo-font-lock-keywords): Use it.
(texinfo-mode-menu): New menu.
(texinfo-inside-macro-p, texinfo-inside-env-p, texinfo-insert-quote):
New functions.
(texinfo-mode-map): Bind " to insert-quote and M-RET to insert-@item.
(texinfo-section-types-regexp, texinfo-section-level-regexp)
(texinfo-subsection-level-regexp, texinfo-subsubsection-level-regexp):
Remove declaration.
(texinfo-show-structure): Use outline-regexp and texinfo-section-list.