Add check to prevent multiple follow notifications from the same user

Closes #397

See merge request pleroma/pleroma!591

fix user search results for users with unset display name

Closes #499

See merge request pleroma/pleroma!625

fix 486: Add option --assume-yes to allow mix pleroma.user to work non-interactive

See merge request pleroma/pleroma!627

Don't crash on AP request for tombstone

See merge request pleroma/pleroma!630

Strip HTML in and allow emoji in summaries.

See merge request pleroma/pleroma!631

Because tombstone objects has no addressing the is_public?-predicate
would cause an error that propagated as a 500 error in the api

rich media: use cachex to avoid flooding remote servers

See merge request pleroma/pleroma!629

Different caches based on the module. Remove scrubber version since it is not relevant anymore

See merge request pleroma/pleroma!628

URL previews in posts

Closes #402

See merge request pleroma/pleroma!617

Activitypub c2s delete activity

See merge request pleroma/pleroma!618

rewrites List.foldl to Enum.each in RetryQueue

See merge request pleroma/pleroma!621

Remove media proxy examples in config/config.exs

See merge request pleroma/pleroma!624

1. this was overriding the real defaults
2. it's documented in `config/config.md`

user: check that the follow request actually has an active account associated with it

See merge request pleroma/pleroma!623

Make captcha (kocaptcha) stateless

See merge request pleroma/pleroma!585

Add handler for Phoenix-style socket.

See merge request pleroma/pleroma!619

because of user refetch, accounts can stop existing (get_from_ap_id() can fail), accordingly
filter the follow requests for these failures.

Reserve /media

See merge request pleroma/pleroma!620