configurable media upload limits

Closes #118

See merge request pleroma/pleroma!401

s3 uploader: force public URIs through media proxy

See merge request pleroma/pleroma!403

utils: fix another possible leak with private S3 backends using mediaproxy

See merge request pleroma/pleroma!402

same rationale as the other mediaproxy changes

twitter/mastodon api: always use mediaproxy URLs in attachments

Closes #329

See merge request pleroma/pleroma!400

if using local media, the mediaproxy will not replace the URL anyway.

mix tasks: add new task to unsubscribe all users from, and then ban a remote user (e.g. followbots)

See merge request pleroma/pleroma!399

activitypub: fix possible false positives with broken thread filtering

See merge request pleroma/pleroma!398

Cleanup postgresql setup script

See merge request pleroma/pleroma!397

Drop unused CREATEDB privilege.
Do not try to handle multiple run.

update pleroma frontend

See merge request pleroma/pleroma!396

broken thread filtering, part 1

See merge request pleroma/pleroma!394

http: fix mediaproxy FD leaks

See merge request pleroma/pleroma!395

http: enable keepalive / connection pooling (closes #336)

Closes #336

See merge request pleroma/pleroma!393

activitypub utils: fix recipient check when the message is unaddressed (mastodon)

See merge request pleroma/pleroma!392

[Pleroma.Web.Nodeinfo.NodeinfoController]: Have a list of supported features

See merge request pleroma/pleroma!329

Make finmoji optional

See merge request pleroma/pleroma!391

activitypub: splice users into recipient lists when they receive messages at their personal inbox

Closes #343

See merge request pleroma/pleroma!390

closes #343