* Merge traits ToApub and FromApub into ApubObject
* Rewrite community outbox to use new fetcher
* Rewrite community moderators collection
* Rewrite tombstone
* Use new fetcher implementation for post/comment
* rewrite person fetch to use new fetcher
* rewrite community to use new fetcher
* rename new_fetcher to dereference_object_id
* make ObjectId a newtype
* handle deletion in new fetcher
* rewrite apub object search to be generic
* move upsert() method out of ApubObject trait
* simplify ObjectId::new (and fix clippy)