* Increase DNS timeout from 1 second to 5 seconds for MX check

1 seconds is rather short when using a recursive DNS resolver which
hasn't got a cached result already available. Use 5 seconds instead,
which is the timeout value we use for outgoing HTTP queries.

* Add more precise error messages for invalid e-mail addresses

* Fix contrast calculation for thumbnail color extraction

Luminance calculation was using 0-255 RGB values instead of 0-1 sRGB values,
leading to incorrectly-computed contrast values.

Since we use ColorDiff already, just use its XYZ colorspace conversion code
to get the value.

* Require at least 3:1 contrast for both accent and foreground colors

* Lower required contrast for the accent color

* Change content-type to be always computed from file data

Restore previous behavior, detecting the content-type isn't very
expensive, and some instances may serve files as application/octet-stream
regardless of their true type, making fetching media from them fail, while
it used to work pre-3.2.0.

* Add test

- Change audio files to not be stripped of metadata
- Automatically extract cover art from audio if it exists
- Add `thumbnail` parameter to `POST /api/v1/media`, `POST /api/v2/media` and `PUT /api/v1/media/:id`
- Add `icon` to represent it in attachments in ActivityPub
- Fix `preview_url` containing URL of missing missing image when there is no thumbnail instead of null
- Fix duration of audio not being displayed on public pages until the file is loaded

Localization strings:

- "Whitelist mode" -> "Limited federation mode"
- "Blacklist e-mail domain" -> "Block e-mail domain"
- "Whitelist domain" -> "Allow domain for federation"

...And so on

Environment variables (backwards-compatible):

- `WHITELIST_MODE` -> `LIMITED_FEDERATION_MODE`
- `EMAIL_DOMAIN_BLACKLIST` -> `EMAIL_DOMAIN_DENYLIST`
- `EMAIL_DOMAIN_WHITELIST` -> `EMAIL_DOMAIN_ALLOWLIST`

tootctl:

- `tootctl domains purge --whitelist-mode` -> `tootctl domains purge --limited-federation-mode`

Removed badly maintained and no longer relevant .env.production.sample file

* Add tootctl email_domains (block|unblock)

* fix codeclimate issues.

* fix codeclimate issues.

* fix codeclimate issues.

* add list subcommand, remove log_action.

* fix codeclimate issues.

* filter duplicate hostnames,ips before block

* rebase from currnet master branch.
rename email_domains_cli.rb to email_domain_blocks_cli.rb .
rename Mastodon::EmailDomainsCLI to Mastodon::EmailDomainBlocksCLI .
rename command email_domains to email-domain-blocks . (Thor recognizes both of - and _ )
rename subcommand block to add .
rename subcommand unblock to remove .
change the color in list subcommand to while for domain or cyan for childlen.
don't use include() in list subcommand.
suppress console output about succeeded entry.
add console output about count of processed/skipped.
remove capitalization in subcommand description.
remove long_desc in subcommand 'remove'.
remove duplicate where in subcommand 'remove'.

* fix codeclimate issue.

* Add emojis:generate_borders Rake task

* Address review

* Border all dark emoji

* Combine stroke with filter to reduce artifacting

* Cleanup Camera with Flash

* Add stroke-linejoin="round"

The previous filter and tweaks were effectively a poor imitation of it.
There are no artifacts for any dark emoji now!

* Set stroke-width using property

This fixes old versions of Firefox.

* Store emoji in string instead of array

* Use separate arguments for each path segment

* Remove "background: black;"

Fixes #13001

Fix a regression introduced in #13928, caused by TTY::Command building
shell commands by chaining string substitutions.

Ditch TTY::Command and use system instead (both do shell out).

When using one of the docker-compose containers, mastodon:setup will use the
existing .env.production rather than the generated one during the setup steps.

This is because dotenv does not overwrite env variables that are alreayd
defined, and the docker-compose.yml file loads the environment variables
from .env.production.

Fix #13762

Catch tootctl interrupt to prevent confusing stacktrace

- Fix not moving original files of custom emojis
- Fix command failing to move any files with S3 storage
- Fix command marking records as upgraded when move failed

Fix #13594

* Fix "tootctl media remove-orphans" crashing on “Import” files

* Also remove empty directories when removing orphaned media

* add emoji export command to cli

* fix codeclimate issues

* add error when no matching category was found

* add other suggestions

* exit 1 when no matching category is found

* changes according to suggestions

* 

* RubyNein

Y u always autoformat :c

* Update Twemoji to 12.1.5

SVGs from Twemoji repo https://github.com/twitter/twemoji

* Update emoji_map.json to Unicode 12

Fix #13401

Fix #13403

Fix #13371

Monkey-patch Paperclip to perform URL escaping in a slightly more
appropriate way, and get rid of runtime deprecation warnings.