* lisp/isearch.el (isearch-help-map, isearch-mode-map): Don't bind [t]

* lisp/isearch.el (isearch-help-map, isearch-mode-map): Don't bind [t]
to isearch-other-control-char.
(isearch-mode): Add isearch-pre-command-hook to pre-command-hook
and isearch-post-command-hook to post-command-hook.
(isearch-done): Remove isearch-pre-command-hook from pre-command-hook
and isearch-post-command-hook from post-command-hook.
(isearch-unread-key-sequence)
(isearch-reread-key-sequence-naturally)
(isearch-lookup-scroll-key, isearch-other-control-char)
(isearch-other-meta-char): Remove functions.
(isearch-pre-command-hook, isearch-post-command-hook):
New functions based on isearch-other-meta-char rewritten
relying on the new behavior of overriding-terminal-local-map
that does not replace the local keymaps any more.