Breacrumbs, submenu child menus, footer, etc

Added the breadcrumbs. Setup the submenu child submenus. Setup the
medium top range to align wit the main menu open breakpoint so the
submenu will be hidden when the main menu is “closed”. Implemented
$black and $white SCSS variables for rgba() use. Setup to get the
“front-page” template for the front page. Implemented
$ua_eng_main_submenu_root_object_id to print the submenu header.
Stylized/setup footer menus.