Fix profile emojis bypassing mediaproxy and harden CSP

Closes #1810

See merge request pleroma/pleroma!2596

get-packs for local generated pack

Closes #1557

See merge request pleroma/pleroma!2604

Validate actor type

See merge request pleroma/pleroma!2593

Update installation guides

See merge request pleroma/pleroma!2603

Fix minor spelling error

See merge request pleroma/pleroma!2598

Update AdminFE build, re-enables emoji packs

See merge request pleroma/pleroma!2597

- Directives are now separated with ";" instead of " ;",
according to https://www.w3.org/TR/CSP2/#policy-parsing
the space is optional
- Use an IO list, which at the end gets converted to a binary as
opposed to ++ing a bunch of arrays with binaries together and joining
them to a string. I doubt it gives any significant real world advantage,
but the code is cleaner and now I can sleep at night.
- The static part of csp is pre-joined to a single binary at compile time.
Same reasoning as the last point.

Also use atom keys in emoji maps instead of binaries

Closes #1810

They were not properly cleaned later and caused trouble for another tests

Fix ObjectView calling into strange functions

Closes #1807

See merge request pleroma/pleroma!2580

Notification performance fixes

See merge request pleroma/pleroma!2595

ActivityPub: Change ordering to `nulls last` in favorites query

See merge request pleroma/pleroma!2594

This makes it use our existing index and speeds up the query.

Fix favorites query performance

See merge request pleroma/pleroma!2591

Resolve "Don't fail message ingestions when we can't update a user"

Closes #1808

See merge request pleroma/pleroma!2576

Migrations: Add index on client_id and client_secret for apps.

See merge request pleroma/pleroma!2589

Mastodon API Controllers: Use the correct params for rate limiting.

Closes #1813

See merge request pleroma/pleroma!2586

Greatly speeds up app lookup.

Config: Restore old new background image

See merge request pleroma/pleroma!2588

Became lost in a settings restructure

Fix Oban warnings

See merge request pleroma/pleroma!2587

[#1501] Made user feed contain public and unlisted activities

Closes #1501

See merge request pleroma/pleroma!2584

Skip failing `:crypt` test on mac

See merge request pleroma/pleroma!2583

Docs: Document reasonable Postgres settings.

See merge request pleroma/pleroma!2581

Flaky tests

See merge request pleroma/pleroma!2578