ReWork Notification Model/Module/Object/Repository/Factory

- Introduce Repository for interaction with "notify" table
- Introduce Factory for read-only notification objects (they're just loosely based on notification the table!)
- Introduce Objects for type-safe usage at the presentation layer
- Reworked Model, which is now fully based on the notify table, including generated fields (cache, ..)

src/Collection/Notifications.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Friendica\Collection;
+
+use Friendica\BaseCollection;
+use Friendica\Model;
+
+class Notifications extends BaseCollection
+{
+	/**
+	 * @return Model\Notification
+	 */
+	public function current()
+	{
+		return parent::current();
+	}
+}