Refactor namespaces

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

src/Core/NotificationsManager.php

@@ -9,8 +9,6 @@ namespace Friendica\Core;
 use Friendica\BaseObject;
 use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\HTML;
-use Friendica\Core\Logger;
-use Friendica\Core\Protocol;
 use Friendica\Database\DBA;
 use Friendica\Model\Contact;
 use Friendica\Model\Item;