[#1973] Fixed accounts rendering in GET /api/v1/pleroma/chats with truish :restrict_unauthenticated.
Made `Pleroma.Web.MastodonAPI.AccountView.render("show.json", _)` demand :for or :force option in order to prevent incorrect rendering of empty map instead of expected user representation with truish :restrict_unauthenticated setting.

Restricted embedding of relationships where applicable (statuses / notifications / accounts rendering).
Added support for :skip_notifications for accounts listing (index.json).
Adjusted tests.

Add support for funkwhale Audio activity

Closes #764 and #1624

See merge request pleroma/pleroma!2287

reel2bits fixture not included as it lacks the Actor fixture for it.

Closes: #1624
Closes: #764

added mocks for tests which fail with Tesla.Mock.Error

Done via the following command:
git diff fcd5dd25 --stat --name-only | xargs sed -i '/Pleroma Authors/c# Copyright © 2017-2020 Pleroma Authors <https:\/\/pleroma.social\/>'

site_name allow to spoof the origin of the domain and so hacks like:

<!-- served on https://hacktivis.me/tmp/joinmastodon.org.html -->
<meta property="og:image" content="https://hacktivis.me/datalove/img/meme/pleroma/mastodon%2C%20forbidden%20amuse%20yourself.jpeg" />
<meta property="og:title" content="Mastodon: Forbidden Amuse Yourself" />
<meta property="og:site_name" content="joinmastodon.org" />
<meta http-equiv="refresh" content="0; url=http://joinmastodon.org/">

Adds Event support in the same way Video objects are handled, with the
name of the object as message header.

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

[#1335] Implemented notification mutes and reblog mutes as UserRelationships. User to UserRelationship relations and functions refactoring.

Mastodon API, streaming: Add `pleroma.direct_conversation_id` to the `conversation` stream event payload.

Done via the following command:
git diff 1e6c102b --stat --name-only | cat - | xargs sed -i 's/2017-2018 Pleroma Authors/2017-2019 Pleroma Authors/'

Needed for pleroma-fe!941

Move test/web/mastodon_api/*_test.exs to test/web/mastodon_api/controllers and test/web/mastodon_api/views