Refactor namespaces

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

src/Protocol/ActivityPub.php

@@ -4,6 +4,7 @@
  */
 namespace Friendica\Protocol;
 
+use Friendica\Util\JsonLD;
 use Friendica\Util\Network;
 use Friendica\Core\Protocol;
 use Friendica\Model\APContact;

src/Protocol/ActivityPub/Processor.php

@@ -9,7 +9,6 @@ use Friendica\Content\Text\HTML;
 use Friendica\Core\Config;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
-use Friendica\Model\Conversation;
 use Friendica\Model\Contact;
 use Friendica\Model\APContact;
 use Friendica\Model\Item;

src/Protocol/ActivityPub/Transmitter.php

@@ -21,7 +21,6 @@ use Friendica\Content\Text\BBCode;
 use Friendica\Util\JsonLD;
 use Friendica\Util\LDSignature;
 use Friendica\Model\Profile;
-use Friendica\Core\Config;
 use Friendica\Object\Image;
 use Friendica\Protocol\ActivityPub;
 use Friendica\Protocol\Diaspora;

src/Protocol/Email.php

@@ -6,7 +6,6 @@ namespace Friendica\Protocol;
 
 use Friendica\Core\Logger;
 use Friendica\Content\Text\HTML;
-use Friendica\Core\Protocol;
 use Friendica\Model\Item;
 
 /**