Move unfollow protocol to worker task

- Add uid parameter to unfollow hook
- Rework and unify Contact::unfollow, Contact::removeSharer and Contact::terminateFriendship
- Add missing twitterUser property to Twitter\Friendships\Destroy module

src/Module/Api/Mastodon/Accounts/Block.php

@@ -59,8 +59,7 @@ class Block extends BaseApi
 		Contact\User::setBlocked($cdata['user'], $uid, true);
 
 		// Mastodon-expected behavior: relationship is severed on block
-		Contact::terminateFriendship($owner, $contact);
-		Contact::revokeFollow($contact);
+		Contact::terminateFriendship($contact);
 
 		System::jsonExit(DI::mstdnRelationship()->createFromContactId($this->parameters['id'], $uid)->toArray());
 	}