TODO

[✔] Follow users
[✔] Announcements
[✔] Federate the post to our followers (hardcoded for now)
[✔] Handle more than one local actors
[✔] Handle the /actor endpoint
[✔] Create configuration file
[✔] Implement database backend
    [✔] Create a file with the actors we have, their following
        and their followers.
        [✔] `MakeActor` should create a file with that actor.
        [✔] Implement `LoadActor`
        [✔] `actor.Follow` should write the new following to file
        [✔] Handle being followed
        [✔] When followed, the handler should write the new follower to file
        [✔] Make sure we send our boosts to all our followers
[x] Write incoming activities to disk (do we have to?)        
[✔] Write all the announcements (boosts) to the database to 
    their correct actors
[✔] Check if we are already following users
[✔] On GetOutbox read the database and present a list of the
    last posts.
[✔] Make OS-independent (mosty directory separators)
[✔] Create outbox.json programmatically
[✔] Make storage configurable (search for "storage" in project)
[✔] Check if we're boosting only stuff from actors we follow, not whatever comes
    through in our inbox
[✔] Boost not only articles but other things too
[✔] Sanitize input, never allow slashes or dots
[✔] Add summary to actors.json
[✔] Check local actor names for characters illegal for filenames and ban them
    (Done in pherephone, not activityserve)
[✔] Create debug flag
[✔] Write to following only upon accept
    (waiting to actually get an accept so that I can test this)
[✔] Implement webfinger
[✔] Make sure masto finds signature
[✔] Implement Unfollow
[✔] Implement accept (accept when other follow us)
    (done but can't test it pending http signatures)
    Works in pleroma/pixelfed not working on masto
    (nothing works on masto)
[ ] Implement nodeinfo and statistics
[✔] Accept even if already follows us
[✔] Handle paging
[✔] Test paging
[✔] Handle http signatures
[ ] Verify http signatures
[✔] Refactor, comment and clean up
[✔] Split to pherephone and activityServe
[ ] Decide what's to be done with actors removed from `actors.json`.
    [ ] Remove them?
    [ ] Leave them read-only?
    [✔] Leave them as is?
[✔] Handle followers and following uri's
[ ] Do I care about the inbox?
[✔] Expose configuration to apps
[✔] Do not boost replies (configurable)