* message.el (message-yank-original): Unwind-protect while suspending

* message.el (message-yank-original): Unwind-protect while suspending
 font-lock.
(message-mode): Modify for the following changes.
(message-font-lock-keywords-2): Abolished.
(message-font-lock-keywords-1): Abolished.
(message-font-lock-keywords): Unified.
(message-font-lock-cited-text-matcher): Abolished.
(font-lock-after-change-function): Don't advise it.
(message-font-lock-last-position): Abolished.
(message-font-lock-citation-name-max-column): Abolished.
(message-font-lock-cited-text-regexp) Abolished.
(message-font-lock-fence-close-position): Abolished.
(message-font-lock-fence-open-position): Abolished.
(message-font-lock-fence-close-regexp): Abolished.
(message-font-lock-fence-open-regexp): Abolished.