Fix S3 links encoding in Mediaproxy

Closes #580

See merge request pleroma/pleroma!828

Fix credo issues in ./test

See merge request pleroma/pleroma!808

activitypub: user inbox/outbox: `totalItems` removal

See merge request pleroma/pleroma!827

(this is based on a counter in User.Info, but the counter is not reliable.)

It is not really feasible to quickly calculate the totalItems value and
it shouldn't be trusted anyway.

ActivityPub C2S oauth endpoints

See merge request pleroma/pleroma!821

Improve login error for OAuth flow

See merge request pleroma/pleroma!824

User.follow_all: Respect blocks in both directions.

See merge request pleroma/pleroma!823

Mark streaming feature for desktop apps in Clients.md

See merge request pleroma/pleroma!818

Bugfix for MDII Uploader

See merge request pleroma/pleroma!822

Add CSP for mastofe development, remove secure-cookies in MIX_ENV=dev

See merge request pleroma/pleroma!820

This is needed to run dev mode mastofe at the same time

Fix CSP check for 'upgrade-insecure-requests'

See merge request pleroma/pleroma!814

Mark streaming feature for mobile/web apps in Clients.md

See merge request pleroma/pleroma!816

[ci skip]

Filter summary field in KeywordPolicy

See merge request pleroma/pleroma!812

Feature/thread muting

See merge request pleroma/pleroma!796

rich media: tighten fetching timeouts and size limits

See merge request pleroma/pleroma!809

Revert "Merge branch 'object-creation' into 'develop'"

See merge request pleroma/pleroma!810