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`approve_friend_request`, and `deny_friend_request` actions.
Add follow_request_count to the user view.

activitypub: transmogrifier: fix up to/cc addressing brain damage caused by mastodon-style explicit DMs

Top level of the likes OrderedCollection is inlined to get immediate
access to totalItems. Because the count can be returned without scanning
the database for like activities the extra query is saved when the
client only wants to display the total.

Activities returned from inbox can include other types of objects like
Article

this causes JSON-LD parsers to get upset and has also lead to developer confusion from outside
projects which tried to parse our internal data.  accordingly, it seems better to just remove
it.

Related to #85

Everything should now be configured at runtime, with the exception of
the `Pleroma.HTML` scrubbers (the scrubbers used can be
changed at runtime, but their configuration is compile-time) because
it's building a module with a macro.