Fix after breaking dependencies on ITERATE and ARNESI

* yaclml.asd (:yaclml): Add dependency on ALEXANDRIA

* attribute-bind.lisp (attribute-bind): Use LOOP not ITER
(illegal-attribute-use): Don't use AIF

* http.lisp: New file stolen from it.bese.arnesi, but set in the
yaclml package.

* utils.lisp: Ditto..

* yaclml.asd (:yaclml): Add "utils" and "http", remove "svg"

* yaclml.lisp (with-yaclml-output-to-string, emit-attribute-value)
(emit-princ-attributes, wrap-in-tag): use
ALEXANDRIA:WITH-UNIQUE-NAMES and plain LOOP.

* tags/html4.lisp (:compile-toplevel, def-empty-html-tag)
(def-html-tag): Use plain LOOP and ALEXANDRIA:WITH.UNIQUE-NAMES.
(<:html): use ALEXANDRIA:XOR

* tags/svg.lisp: Delete. Too much work to make compile and
questionable usefulness.