Add ability to get breadcrumbs from menus #1
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This adds the ability to get breadcrumbs for the current object if any menuitem links to it.
The templatetag includes the preferred menu slug in case the same object is linked to from more than one menu (typically a header and footer menu). If no menu with that slug is found, it picks the first menu with a link to the object.
If no menu item is found, render nothing.
Note: This does not require the menu itself to be rendered on the page, so it can be used to construct "Shadow" menus just to enable breadcrumbs.