Photo to src

Move Photo to Friendica\Object namespace and replace require_once statments with use statements.

include/network.php

@@ -1,13 +1,12 @@
 <?php
-
 /**
  * @file include/network.php
  */
-
 use Friendica\App;
 use Friendica\Core\System;
 use Friendica\Core\Config;
 use Friendica\Network\Probe;
+use Friendica\Object\Photo;
 use Friendica\Util\XML;
 
 /**
@@ -687,7 +686,6 @@ function scale_external_images($srctext, $include_link = true, $scale_replace =
 	$matches = null;
 	$c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism', $s, $matches, PREG_SET_ORDER);
 	if ($c) {
-		require_once 'include/Photo.php';
 		foreach ($matches as $mtch) {
 			logger('scale_external_image: ' . $mtch[1]);