(perform-replace): Add isearch-case-fold-search.

(perform-replace): Add isearch-case-fold-search.
Use delimited-flag for isearch-regexp.
Reset isearch-lazy-highlight-last-string to force lazy
highlighting when called from isearch mode.
(query-replace-highlight): Revert defcustom type to boolean.
(query-replace-lazy-highlight): New defcustom.
(query-replace): New face.
(perform-replace, replace-highlight, replace-dehighlight):
Test query-replace-lazy-highlight instead of special value
`isearch' of query-replace-highlight.
(replace-dehighlight): Don't call isearch-dehighlight.
(replace-highlight): Don't call isearch-highlight.
Use face `query-replace' unconditionally.