Breadcrumb library class

All breadcrumbs replaced by breadcrumb class methods.

Class contains 4 methods:

__construct($registry)
implements $url object, $language object, $session object (for admin token)

add ($text, $route, $query, $separator, $ssl)
searches language object for passed in $text variable or returns $text
$separator returns $language->text_separator

last ($text)
searches language object for passed in $text variable or returns $text
returns only text for proper breadcrumb structure
last breadcrumb should never be linked

fetch()
returns breadcrumb object

in templates $breadcrumbs array now contains $link which is the entire anchor object both href and text

foreach ($breadcrumbs as $breadcrumb) {
	echo $breadcrumb['link']
}

* all breadcrumbs have been replaced in both admin and catalog
* modification added
* instantiated in index.php and admin/index.php

Signed-off-by: Vince Kronlein <vince.kronlein@gmail.com>