Refactor namespaces

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

src/Object/Image.php

@@ -12,7 +12,6 @@ use Friendica\Core\L10n;
 use Friendica\Core\Logger;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
-use Friendica\Model\Contact;
 use Friendica\Model\Photo;
 use Friendica\Util\Network;
 use Exception;

src/Object/Post.php

@@ -16,7 +16,6 @@ use Friendica\Core\Protocol;
 use Friendica\Core\Renderer;
 use Friendica\Database\DBA;
 use Friendica\Model\Contact;
-use Friendica\Model\Conversation;
 use Friendica\Model\Item;
 use Friendica\Model\Term;
 use Friendica\Util\Crypto;

src/Object/Thread.php

@@ -7,7 +7,6 @@ namespace Friendica\Object;
 use Friendica\BaseObject;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
-use Friendica\Object\Post;
 use Friendica\Util\Security;
 
 /**