#3595143 Add Typed Relation 'raw' formatter to expose rel_type and target_id

[kayakr]

#3595143 Add Typed Relation 'raw' formatter to expose rel_type and target_id

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What does this Pull Request do?

Offers new Typed Relation formatter "Typed Relation Formatter (Raw)" that exposes 'raw' rel_type and target_id data, e.g. relators:art=1234 suitable for audit view, or export and import processes.

How should this be tested?

1. Apply patch/PR
2. Visit view involving entities with typed relations
3. Change view field display to sue "Typed Relation Formatter (Raw)"
4. Observe 'raw' data output in view preview.

Interested parties

@Islandora/committers

[joecorall]

$elements = parent::viewElements($items, $langcode); does entity access checking on the referenced entities. So it's possible an element in $items doesn't exist in $elements and we leak its relator and term ID. Not a big deal, but maybe we should iterate over $elements? Maybe something like

Suggested change

	foreach ($items as $delta => $item) {
	$elements[$delta]['#plain_text'] = $item->rel_type . '=' . $item->target_id;
	}
	foreach ($elements as $delta => &$element) {
	$item = $items[$delta];
	$element['#plain_text'] = $item->rel_type . '=' . $item->target_id;
	}