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

This reverts commit 9cb1ff7330.

plugins/vendor/zbateson/mail-mime-parser/src/Parser/HeaderParserService.php

@@ -1,67 +0,0 @@
-<?php
-/**
- * This file is part of the ZBateson\MailMimeParser project.
- *
- * @license http://opensource.org/licenses/bsd-license.php BSD
- */
-
-namespace ZBateson\MailMimeParser\Parser;
-
-use Psr\Log\LogLevel;
-use ZBateson\MailMimeParser\Message\PartHeaderContainer;
-
-/**
- * Reads headers from an input stream, adding them to a PartHeaderContainer.
- *
- * @author Zaahid Bateson
- */
-class HeaderParserService
-{
-    /**
-     * Ensures the header isn't empty and contains a colon separator character,
-     * then splits it and adds it to the passed PartHeaderContainer.
-     *
-     * @param int $offset read offset for error reporting
-     * @param string $header the header line
-     * @param PartHeaderContainer $headerContainer the container
-     */
-    private function addRawHeaderToPart(int $offset, string $header, PartHeaderContainer $headerContainer) : static
-    {
-        if ($header !== '') {
-            if (\strpos($header, ':') !== false) {
-                $a = \explode(':', $header, 2);
-                $headerContainer->add($a[0], \trim($a[1]));
-            } else {
-                $headerContainer->addError(
-                    "Invalid header found at offset: $offset",
-                    LogLevel::ERROR
-                );
-            }
-        }
-        return $this;
-    }
-
-    /**
-     * Reads header lines up to an empty line, adding them to the passed
-     * PartHeaderContainer.
-     *
-     * @param resource $handle The resource handle to read from.
-     * @param PartHeaderContainer $container the container to add headers to.
-     */
-    public function parse($handle, PartHeaderContainer $container) : static
-    {
-        $header = '';
-        do {
-            $offset = \ftell($handle);
-            $line = MessageParserService::readLine($handle);
-            if ($line === false || $line === '' || $line[0] !== "\t" && $line[0] !== ' ') {
-                $this->addRawHeaderToPart($offset, $header, $container);
-                $header = '';
-            } else {
-                $line = "\r\n" . $line;
-            }
-            $header .= \rtrim($line, "\r\n");
-        } while ($header !== '');
-        return $this;
-    }
-}