Refactor layout elements (open & close) for better option filtering.

Changing the filter names to use _options_ instead of _attributes_ and
add a passed argument of the element to the filter.
Make $element_ (open & close) filter option names clearer.

It's functionality... action... for consistency, silly.
Starting to convert to HTML5. Add HTML4 support file.
HTML5 support for fnbx_access_menu convert DIV to NAV
HTML5 *_post_open *_post_close use ARTICLE tag, use consistant filter names.
Introduce fnbx_htmlfive_element_tag_get to return HTML5 tags based on a lucky guess from the passed $element