Refactor namespaces

- Remove unused use statements
- Add required use statements
- Escape global classes

src/Worker/APDelivery.php

@@ -9,7 +9,6 @@ use Friendica\Core\Logger;
 use Friendica\Core\Worker;
 use Friendica\Model\ItemDeliveryData;
 use Friendica\Protocol\ActivityPub;
-use Friendica\Model\Item;
 use Friendica\Util\HTTPSignature;
 
 class APDelivery extends BaseObject