[VUFIND-747] Create Breadcrumbs view helper. #4236
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This PR adds a view helper that uses templates to render breadcrumb trails. This makes it easier to customize and modify breadcrumbs globally, and makes breadcrumb construction more readable in individual templates.
For now, the helper manipulates
$this->layout()->breadcrumbs
for backward compatibility, but it could be modified to use its own internal string instead of the layout at some point in the future if we want to make it more self-contained.TODO