* ID is supposed to be the database ID
* UID is the IMAP UID
* UUID is the globally unique identifier used in the front-end

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Bump lodash from 4.17.15 to 4.17.19

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.19

)

Signed-off-by: dependabot[bot] <support@github.com>

Revive aliases feature

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Fixed eslint errors and php-cs check errors

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Second round of eslint and php-cs check fixes

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Reverted translation changes and applied PR suggestions to Alias.php

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Implemented design suggestions. Changed code to now use await/async

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Changed aliases to not include a full copy of the account object

Signed-off-by: Patrick Bender <patrick@bender-it-services.de>

Fix folder creation design

Signed-off-by: GretaD <gretadoci@gmail.com>

Do not combine threads with identical subjects

Build message threads after each sync and store thread root ID for later reference

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Merge pull request #3361 from nextcloud/dependabot/composer/symfony/event-dispatcher-contracts-1.1.9

Bumps symfony/event-dispatcher-contracts from 1.1.7 to 1.1.9.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps symfony/service-contracts from 1.1.8 to 1.1.9.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [phpspec/prophecy](https://github.com/phpspec/prophecy) from 1.10.3 to 1.11.1.
- [Release notes](https://github.com/phpspec/prophecy/releases)
- [Changelog](https://github.com/phpspec/prophecy/blob/master/CHANGES.md)
- [Commits](https://github.com/phpspec/prophecy/compare/v1.10.3...1.11.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Add real-world test for a linear message thread

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Implement the jwz threading algorithm

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Make sure all commands return an int

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Store the `references`, `in-reply-to` and the thread root id