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

This reverts commit 9cb1ff7330.

plugins/vendor/directorytree/imapengine/src/MessageParser.php

@@ -1,30 +0,0 @@
-<?php
-
-namespace DirectoryTree\ImapEngine;
-
-use ZBateson\MailMimeParser\IMessage;
-use ZBateson\MailMimeParser\MailMimeParser;
-
-class MessageParser
-{
-    /**
-     * The mail mime parser instance.
-     */
-    protected static ?MailMimeParser $parser = null;
-
-    /**
-     * Parse the given message contents.
-     */
-    public static function parse(string $contents): IMessage
-    {
-        return static::parser()->parse($contents, true);
-    }
-
-    /**
-     * Get the mail mime parser instance.
-     */
-    protected static function parser(): MailMimeParser
-    {
-        return static::$parser ??= new MailMimeParser;
-    }
-}