Revert "Add new optional beta email parser thats based on ImapEngine instead of Webklex"

This reverts commit 9cb1ff7330.

plugins/vendor/symfony/mime/Encoder/MimeHeaderEncoderInterface.php

@@ -1,23 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mime\Encoder;
-
-/**
- * @author Chris Corbyn
- */
-interface MimeHeaderEncoderInterface
-{
-    /**
-     * Get the MIME name of this content encoding scheme.
-     */
-    public function getName(): string;
-}