For approval-required registrations mode

* Add test to handle suspended and missing users in BootstrapTimelineService

* Fix BootstrapTimelineService crashing when bootstrapped accounts are invalid

It is not really necessary and we need to reduce requests

* Add voters count to polls

* Add ActivityPub serialization and parsing of voters count

* Add support for voters count in WebUI

* Move incrementation of voters count out of redis lock

* Reword “voters” to “people”

Fix #11956

Make it so normal search returns even unreviewed matches, but
autosuggestions do not.

Fix #11960

* Change silenced accounts to require approval on follow

* Also require approval for follows by people explicitly muted by target accounts

* Do not auto-accept silenced or muted accounts when switching from locked to unlocked

* Add `follow_requests_count` to verify_credentials

* Show “Follow requests” menu item if needed even if account is locked

* Add tests

* Correctly reflect that follow requests weren't auto-accepted when local account is silenced

* Accept follow requests from user-muted accounts to avoid leaking mutes

* Fallback to Database search when ES not available

* Prevent double work if ES gives 0 result

* Apply suggestion from code review

Instead of detecting spam on first duplicate message, add a
threshold of 5 such messages to reduce false positives

Don't put Move handler on cooldown if it didn't run. Skip unmerging
from timelines to save unnecessary work.

Fix #11771

Change all account actions except "none" to resolve all unresolved reports

Refactor `SuspendAccountService` to be more readable

Fix deletion of unconfirmed account not freeing up the username

Add prefill of logged-in user's email in the reconfirmation form

* Add profile directory to web UI

* Add a line of bio to the directory

The reason for unattaching media instead of removing it is to support
delete & redraft functionality, but remote or staff-removed statuses
will never be redrafted, so the media should be deleted immediately

* Add more accurate hashtag search

Using ElasticSearch to index hashtags with edge n-grams and score
them by usage within the last 7 days since last activity. Only
hashtags that have been reviewed and are listable can appear in
searches, unless they match the query exactly

* Fix search analyzer dropping non-ascii characters

- Restrict followers counts to local users to minimize local advantage
- Fix emoji shortcodes causing error in search
- Fix search syntax parse errors not being caught

* Add more accurate account search

When ElasticSearch is available, a more accurate search is implemented:

- Using edge n-gram index for acct and display name
- Using asciifolding and cjk width normalization on display names
- Using Gaussian decay on account activity for additional scoring (recency)
- Using followers/friends ratio for additional scoring (spamminess)
- Using followers number for additional scoring (size)

The exact match precedence only takes effect when the input conforms
to the username format and the username part of it is complete, i.e.
when the user started typing the domain part.

* Support single-letter usernames

* Fix tests

* Fix not picking up account updates

* Add weights and normalization for scores, skip zero terms queries

* Use local counts for accounts index, adjust search parameters

* Fix mistakes

* Using updated_at of accounts is inadequate for remote accounts

Fix #11365

Fix #11494

* Add database columns for adding notes to domain blocks/restrctions

* Add admin UI to set private and public comments when blocking a domain

* Add text for private and public comments on domain blocks

* Show domain block comments in admin UI

* Add comments to the domain block undo page

* Make UnblockDomainService more robust regarding upgraded domain blocks

* Allow editing domain blocks

* Rename button from “undo domain block” to “view domain block” in account admin UI

* Change test to unsilence silenced users from upgraded blocks

Regression from f371b32

Fix hashtag links always being lowercase

* Disable invite links from disabled/suspended users

* Add has_many invites relationship to users

* Destroy unused invites when suspending an account

Now that the request is signed, it can return private toots. Do not leak them.

* Add a spam check

* Use Nilsimsa to generate locality-sensitive hashes and compare using Levenshtein distance

* Add more tests

* Add exemption when the message is a reply to something that mentions the sender

* Use Nilsimsa Compare Value instead of Levenshtein distance

* Use MD5 for messages shorter than 10 characters

* Add message to automated report, do not add non-public statuses to
automated report, add trust level to accounts and make unsilencing
raise the trust level to prevent repeated spam checks on that account

* Expire spam check data after 3 months

* Add support for local statuses, reduce expiration to 1 week, always create a report

* Add content warnings to the spam check and exempt empty statuses

* Change Nilsimsa threshold to 95 and make sure removed statuses are removed from the spam check

* Add all matched statuses into automatic report

Fixes #11148

* Fix BackupService crashing when an attachment is missing

For various reasons such as admin error or out-of-sync media and
database backups, it might be possible for local attachments to be lost.

This commit allows the BackupService to continue its work even if some media
file is missing.

* Change error message

* Remove Salmon and PubSubHubbub endpoints

* Add error when trying to follow OStatus accounts

* Fix new accounts not being created in ResolveAccountService

Fixes #11127

* Change domain blocks to automatically support subdomains

If a more authoritative domain is blocked (example.com), then the
same block will be applied to a subdomain (foo.example.com)

* Match subdomains of existing accounts when blocking/unblocking domains

* Improve code style

* Add audio uploads

Fix #4827

Accept uploads of OGG, WAV, FLAC, OPUS and MP3 files, and converts
them to OGG. Media attachments get a new `audio` type. In the UI,
audio uploads are displayed identically to video uploads.

* Improve code style