Refactor collection repositories: use one instance per databox

lib/Alchemy/Phrasea/Collection/Reference/CollectionReferenceRepository.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection\Reference;
+
+interface CollectionReferenceRepository
+{
+    /**
+     * @return CollectionReference[]
+     */
+    public function findAll();
+
+    /**
+     * @param int $databoxId
+     * @return CollectionReference[]
+     */
+    public function findAllByDatabox($databoxId);
+
+    /**
+     * @param int $baseId
+     * @return CollectionReference|null
+     */
+    public function find($baseId);
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return CollectionReference|null
+     */
+    public function findByCollectionId($databoxId, $collectionId);
+}