SoapServer/Client now handle binary files correctly & large tests/fixtures update

Soap Server and Client were breaking binary files during transfer due to invalid Mime Message Parser. Now is it working fine with no errors, but the message parser is about to be rewritten into a better form.

tests/Fixtures/Attachment/MessageWithAttachmentsTrait.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Fixtures\Attachment;
+
+trait MessageWithAttachmentsTrait
+{
+    /**
+     * @var AttachmentCollection $attachmentCollection
+     */
+    public $attachmentCollection;
+
+    public function hasAttachments()
+    {
+        return $this->attachmentCollection !== null && $this->attachmentCollection->hasAttachments();
+    }
+}