User search: Remove trigram and refactor the module

See merge request pleroma/pleroma!1850

Ability to toggle activation status, permission group & delete multiple users

Closes admin-fe#39

See merge request pleroma/pleroma!1825

While the case tested (`lain@ple`) gives wrong ordering due to
using only trigram to order, it almost never happens in reality. In reality
it would be either `lain` (in which case it's fine to list the user with `lain`
in display name first), or `@lain@pleroma.soykaf.com`/`lain@pleroma.soykaf.com` (which is
handled fine as well)

Benchmark finishing

Closes #755

See merge request pleroma/pleroma!1848

- Remove trigram as it tends to rank garbage results highly, resulting
in it prioritized above fts, which gives actually decent results. ACKed
by kaniini and lain on irc.
- Remove a test for handling misspelled requests, since we no longer have
trigram
- Remove a test for searching users with `nil` display names, because it
is unrealistic, we don't accept usernames that are not >1 char strings
- Make rank boosting for followers/followees sane again, previous values
resulted in garbage matches getting on top just because the users are
followers/followees

Mastodon API: Add `exclude_visibilities` parameter to the timeline and notification endpoints

See merge request pleroma/pleroma!1818

Backport "Fix hiding branch name logic" to develop

See merge request pleroma/pleroma!1846

Preparations for renaming `master` to `stable`

See merge request pleroma/pleroma!1840

message

Assorted transmogrifier fixes

See merge request pleroma/pleroma!1831

Make MediaProxy failure tracking less brutal

See merge request pleroma/pleroma!1836

The current failure tracking mechanism will never request anything that
didn't respond with a success, 403, 404, or 5xx codes. This is causing
issues when using in real fediverse because of weird status codes
some software has and timeouts being frequent. This patch changes
failure tracking mechanism to only never request the url again if it
responded with 400, 204, or the body is too large, otherwise it can be
re-requested in 60 seconds.

pleroma_ctl: Make it possible to specify branches/flavours when updating

See merge request pleroma/pleroma!1832

Turns out you can't actually find the user with this.

Search: Add tests for unicode searches.

See merge request pleroma/pleroma!1824

provide mocks for webfinger endpoints

See merge request pleroma/pleroma!1821

Add `pleroma.direct_conversation_id` to `GET /api/v1/statuses/:id`

See merge request pleroma/pleroma!1822

Add a task to re-count statuses for all users

Closes #1305

See merge request pleroma/pleroma!1823