Re-implement smie matching block highlight using show-paren-data-function.

Re-implement smie matching block highlight using show-paren-data-function.

* emacs-lisp/smie.el (smie-matching-block-highlight)
(smie--highlight-matching-block-overlay)
(smie--highlight-matching-block-lastpos)
(smie-highlight-matching-block)
(smie-highlight-matching-block-mode): Remove.
(smie--matching-block-data-cache): New variable.
(smie--matching-block-data): New function.
(smie-setup): Use smie--matching-block-data for
show-paren-data-function.

* progmodes/octave.el (octave-mode-menu): Fix.
(octave-find-definition): Skip garbage lines.