Move replace_title into dedicated plugin

Title replacement is not related to proxification.

Author: reef-actor

src/Plugin/ProxifyPlugin.php

@@ -4,7 +4,6 @@
 
 use Proxy\Plugin\AbstractPlugin;
 use Proxy\Event\ProxyEvent;
-use Proxy\Config;
 
 class ProxifyPlugin extends AbstractPlugin {
 
@@ -101,12 +100,6 @@ private function meta_refresh($matches){
 	// <title>, <base>, <link>, <style>, <meta>, <script>, <noscript>
 	private function proxify_head($str){
 
-		// let's replace page titles with something custom
-		if(Config::get('replace_title')){
-			$str = preg_replace('/<title[^>]*>(.*?)<\/title>/is', '<title>'.Config::get('replace_title').'</title>', $str);
-		}
-		
-		
 		// base - update base_url contained in href - remove <base> tag entirely
 		//$str = preg_replace_callback('/<base[^>]*href=
 

src/Plugin/ReplaceTitlePlugin.php

@@ -0,0 +1,24 @@
+<?php
+namespace Proxy\Plugin;
+
+use Proxy\Plugin\AbstractPlugin;
+use Proxy\Event\ProxyEvent;
+use Proxy\Config;
+
+class ReplaceTitlePlugin extends AbstractPlugin
+{
+    public function onCompleted(ProxyEvent $event)
+    {
+        $response = $event['response'];
+        $content_type = $response->headers->get('content-type');
+        if (strpos($content_type, 'text/html') === false) {
+            return;
+        }
+
+        if (Config::get('replace_title')) {
+            $content = $response->getContent();
+            $content = preg_replace('/<title[^>]*>(.*?)<\/title>/is', '<title>'.Config::get('replace_title').'</title>', $content);
+            $response->setContent($content);
+        }
+    }
+}