[#1505] Restricted max thread distance for fetching replies on incoming federation (in addition to reply-to depth restriction).

[#1505] Improved replies-handling tests: updated Mastodon message fixture, used exact Pleroma federation message.

[#1505] Removed wrapping of reply URIs into `first` element, added comments to transmogrifier tests.

[#1505] Added tests, changelog entry, tweaked config settings related to replies output on outgoing federation.

Actually fix upload limit on OTP releases

Closes #1109

See merge request !2185

Closes #1109

Add support for cancellation of a follow request

Closes #1522

See merge request !2175

Questions: Add timezone to `closed` property

Closes #1552

See merge request !2184

Includes functionality needed to fix upload limit not being changed at
runtime:
https://github.com/elixir-plug/plug/commit/087cd64d864696c74bf07f935e2ae31caec19a1e

EmojiReactions: Rename to EmojiReacts

See merge request !2181

Fix for config.md

See merge request !2182

Update FE bundle

See merge request !2180

mastodon API: do not sanitize html in non-html fields

See merge request !2167

Simplify in-database config docs

See merge request !2178

Config changes

Closes #1547

See merge request !2174

Large part of it was no longer true (i.e none of the changes need
recompilation anymore and you can't brick an instance by changing them,
it's not necessary to manually truncate the db manually anymore)

fix not being able to pin polls

See merge request !2172

Removing migrate_from_db endpoint from admin api

See merge request !2177

Remove AutoLinker `scheme` option from the config

See merge request !2176

Restarting pleroma from outside application

See merge request !2144

Make attachments cleanup optional

See merge request !2170