* Remove CommentInReplyToMigration
* Remove compat for RemovePostCommentOrCommunity
* Remove PublicUrlMigration
* Change type of pm to ChatMessage from Pleroma, make pm.to array
* Use person.summary instead of person.content for pleroma compat
* Also change group.content to summary
* Rewrite apub object test json to serve as nice examples
* Also add test case for parsing pleroma private message
