Turn on more lexical-binding

Turn on more lexical-binding

* lisp/dom.el:
* lisp/faces.el:
* lisp/htmlfontify.el: Turn on lexical-binding.
(htmlfontify-string): Use pushnew instead of add-to-list.
* lisp/info-xref.el:
* lisp/isearch.el:
* lisp/man.el:
* lisp/ps-def.el:
* lisp/ps-print.el:
* lisp/replace.el: Turn on lexical-binding.  Require cl-lib at compile
time.
(multi-occur): Use cl-pushnew instead of add-to-list.
(replace-match-string-symbols): Remove unused lexical variable.
(replace-search, replace-highlight): Fix argument shadowing.
* lisp/sort.el:
* lisp/xml.el: Turn on lexical-binding.
(xml--parse-buffer): Use push instead of add-to-list.
* lisp/xt-mouse.el: Turn on lexical-binding.