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diff --git a/vendor/swiftmailer/classes/Swift/Mime/SimpleHeaderSet.php b/vendor/swiftmailer/classes/Swift/Mime/SimpleHeaderSet.php
deleted file mode 100644
index 3bc60e14..00000000
--- a/vendor/swiftmailer/classes/Swift/Mime/SimpleHeaderSet.php
+++ /dev/null
@@ -1,383 +0,0 @@
-<?php
-
-/*
- * This file is part of SwiftMailer.
- * (c) 2004-2009 Chris Corbyn
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-/**
- * A collection of MIME headers.
- *
- * @author     Chris Corbyn
- */
-class Swift_Mime_SimpleHeaderSet implements Swift_Mime_HeaderSet
-{
-    /** HeaderFactory */
-    private $_factory;
-
-    /** Collection of set Headers */
-    private $_headers = array();
-
-    /** Field ordering details */
-    private $_order = array();
-
-    /** List of fields which are required to be displayed */
-    private $_required = array();
-
-    /** The charset used by Headers */
-    private $_charset;
-
-    /**
-     * Create a new SimpleHeaderSet with the given $factory.
-     *
-     * @param Swift_Mime_HeaderFactory $factory
-     * @param string                   $charset
-     */
-    public function __construct(Swift_Mime_HeaderFactory $factory, $charset = null)
-    {
-        $this->_factory = $factory;
-        if (isset($charset)) {
-            $this->setCharset($charset);
-        }
-    }
-
-    /**
-     * Set the charset used by these headers.
-     *
-     * @param string $charset
-     */
-    public function setCharset($charset)
-    {
-        $this->_charset = $charset;
-        $this->_factory->charsetChanged($charset);
-        $this->_notifyHeadersOfCharset($charset);
-    }
-
-    /**
-     * Add a new Mailbox Header with a list of $addresses.
-     *
-     * @param string       $name
-     * @param array|string $addresses
-     */
-    public function addMailboxHeader($name, $addresses = null)
-    {
-        $this->_storeHeader($name,
-        $this->_factory->createMailboxHeader($name, $addresses));
-    }
-
-    /**
-     * Add a new Date header using $timestamp (UNIX time).
-     *
-     * @param string  $name
-     * @param int     $timestamp
-     */
-    public function addDateHeader($name, $timestamp = null)
-    {
-        $this->_storeHeader($name,
-        $this->_factory->createDateHeader($name, $timestamp));
-    }
-
-    /**
-     * Add a new basic text header with $name and $value.
-     *
-     * @param string $name
-     * @param string $value
-     */
-    public function addTextHeader($name, $value = null)
-    {
-        $this->_storeHeader($name,
-        $this->_factory->createTextHeader($name, $value));
-    }
-
-    /**
-     * Add a new ParameterizedHeader with $name, $value and $params.
-     *
-     * @param string $name
-     * @param string $value
-     * @param array  $params
-     */
-    public function addParameterizedHeader($name, $value = null, $params = array())
-    {
-        $this->_storeHeader($name, $this->_factory->createParameterizedHeader($name, $value, $params));
-    }
-
-    /**
-     * Add a new ID header for Message-ID or Content-ID.
-     *
-     * @param string       $name
-     * @param string|array $ids
-     */
-    public function addIdHeader($name, $ids = null)
-    {
-        $this->_storeHeader($name, $this->_factory->createIdHeader($name, $ids));
-    }
-
-    /**
-     * Add a new Path header with an address (path) in it.
-     *
-     * @param string $name
-     * @param string $path
-     */
-    public function addPathHeader($name, $path = null)
-    {
-        $this->_storeHeader($name, $this->_factory->createPathHeader($name, $path));
-    }
-
-    /**
-     * Returns true if at least one header with the given $name exists.
-     *
-     * If multiple headers match, the actual one may be specified by $index.
-     *
-     * @param string  $name
-     * @param int     $index
-     *
-     * @return bool
-     */
-    public function has($name, $index = 0)
-    {
-        $lowerName = strtolower($name);
-
-        return array_key_exists($lowerName, $this->_headers) && array_key_exists($index, $this->_headers[$lowerName]);
-    }
-
-    /**
-     * Set a header in the HeaderSet.
-     *
-     * The header may be a previously fetched header via {@link get()} or it may
-     * be one that has been created separately.
-     *
-     * If $index is specified, the header will be inserted into the set at this
-     * offset.
-     *
-     * @param Swift_Mime_Header $header
-     * @param int               $index
-     */
-    public function set(Swift_Mime_Header $header, $index = 0)
-    {
-        $this->_storeHeader($header->getFieldName(), $header, $index);
-    }
-
-    /**
-     * Get the header with the given $name.
-     *
-     * If multiple headers match, the actual one may be specified by $index.
-     * Returns NULL if none present.
-     *
-     * @param string  $name
-     * @param int     $index
-     *
-     * @return Swift_Mime_Header
-     */
-    public function get($name, $index = 0)
-    {
-        if ($this->has($name, $index)) {
-            $lowerName = strtolower($name);
-
-            return $this->_headers[$lowerName][$index];
-        }
-    }
-
-    /**
-     * Get all headers with the given $name.
-     *
-     * @param string $name
-     *
-     * @return array
-     */
-    public function getAll($name = null)
-    {
-        if (!isset($name)) {
-            $headers = array();
-            foreach ($this->_headers as $collection) {
-                $headers = array_merge($headers, $collection);
-            }
-
-            return $headers;
-        }
-
-        $lowerName = strtolower($name);
-        if (!array_key_exists($lowerName, $this->_headers)) {
-            return array();
-        }
-
-        return $this->_headers[$lowerName];
-    }
-
-    /**
-     * Return the name of all Headers
-     *
-     * @return array
-     */
-    public function listAll()
-    {
-        $headers = $this->_headers;
-        if ($this->_canSort()) {
-            uksort($headers, array($this, '_sortHeaders'));
-        }
-
-        return array_keys($headers);
-    }
-
-  /**
-     * Remove the header with the given $name if it's set.
-     *
-     * If multiple headers match, the actual one may be specified by $index.
-     *
-     * @param string  $name
-     * @param int     $index
-     */
-    public function remove($name, $index = 0)
-    {
-        $lowerName = strtolower($name);
-        unset($this->_headers[$lowerName][$index]);
-    }
-
-    /**
-     * Remove all headers with the given $name.
-     *
-     * @param string $name
-     */
-    public function removeAll($name)
-    {
-        $lowerName = strtolower($name);
-        unset($this->_headers[$lowerName]);
-    }
-
-    /**
-     * Create a new instance of this HeaderSet.
-     *
-     * @return Swift_Mime_HeaderSet
-     */
-    public function newInstance()
-    {
-        return new self($this->_factory);
-    }
-
-    /**
-     * Define a list of Header names as an array in the correct order.
-     *
-     * These Headers will be output in the given order where present.
-     *
-     * @param array $sequence
-     */
-    public function defineOrdering(array $sequence)
-    {
-        $this->_order = array_flip(array_map('strtolower', $sequence));
-    }
-
-    /**
-     * Set a list of header names which must always be displayed when set.
-     *
-     * Usually headers without a field value won't be output unless set here.
-     *
-     * @param array $names
-     */
-    public function setAlwaysDisplayed(array $names)
-    {
-        $this->_required = array_flip(array_map('strtolower', $names));
-    }
-
-    /**
-     * Notify this observer that the entity's charset has changed.
-     *
-     * @param string $charset
-     */
-    public function charsetChanged($charset)
-    {
-        $this->setCharset($charset);
-    }
-
-    /**
-     * Returns a string with a representation of all headers.
-     *
-     * @return string
-     */
-    public function toString()
-    {
-        $string = '';
-        $headers = $this->_headers;
-        if ($this->_canSort()) {
-            uksort($headers, array($this, '_sortHeaders'));
-        }
-        foreach ($headers as $collection) {
-            foreach ($collection as $header) {
-                if ($this->_isDisplayed($header) || $header->getFieldBody() != '') {
-                    $string .= $header->toString();
-                }
-            }
-        }
-
-        return $string;
-    }
-
-    /**
-     * Returns a string representation of this object.
-     *
-     * @return string
-     *
-     * @see toString()
-     */
-    public function __toString()
-    {
-        return $this->toString();
-    }
-
-    /** Save a Header to the internal collection */
-    private function _storeHeader($name, Swift_Mime_Header $header, $offset = null)
-    {
-        if (!isset($this->_headers[strtolower($name)])) {
-            $this->_headers[strtolower($name)] = array();
-        }
-        if (!isset($offset)) {
-            $this->_headers[strtolower($name)][] = $header;
-        } else {
-            $this->_headers[strtolower($name)][$offset] = $header;
-        }
-    }
-
-    /** Test if the headers can be sorted */
-    private function _canSort()
-    {
-        return count($this->_order) > 0;
-    }
-
-    /** uksort() algorithm for Header ordering */
-    private function _sortHeaders($a, $b)
-    {
-        $lowerA = strtolower($a);
-        $lowerB = strtolower($b);
-        $aPos = array_key_exists($lowerA, $this->_order)
-            ? $this->_order[$lowerA]
-            : -1;
-        $bPos = array_key_exists($lowerB, $this->_order)
-            ? $this->_order[$lowerB]
-            : -1;
-
-        if ($aPos == -1) {
-            return 1;
-        } elseif ($bPos == -1) {
-            return -1;
-        }
-
-        return ($aPos < $bPos) ? -1 : 1;
-    }
-
-    /** Test if the given Header is always displayed */
-    private function _isDisplayed(Swift_Mime_Header $header)
-    {
-        return array_key_exists(strtolower($header->getFieldName()), $this->_required);
-    }
-
-    /** Notify all Headers of the new charset */
-    private function _notifyHeadersOfCharset($charset)
-    {
-        foreach ($this->_headers as $headerGroup) {
-            foreach ($headerGroup as $header) {
-                $header->setCharset($charset);
-            }
-        }
-    }
-}