[ticket/13697] Moving filesystem related functions to filesystem service

* Moving filesystem service to \phpbb\filesystem namespace
 * Wraping Symfony's Filesystem component
 * Moving filesystem related functions from includes/functions.php
   into \phpbb\filesystem\filesystem
   Functions moved (and deprecated):
     - phpbb_chmod
     - phpbb_is_writable
     - phpbb_is_absolute
     - phpbb_own_realpath
     - phpbb_realpath
 * Adding interface for filesystem service

PHPBB3-13697

phpBB/phpbb/filesystem/exception/filesystem_exception.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\filesystem\exception;
+
+class filesystem_exception extends \phpbb\exception\runtime_exception
+{
+	/**
+	 * Constructor
+	 *
+	 * @param string		$message	The Exception message to throw (must be a language variable).
+	 * @param string		$filename	The file that caused the error.
+	 * @param array			$parameters	The parameters to use with the language var.
+	 * @param \Exception	$previous	The previous runtime_exception used for the runtime_exception chaining.
+	 * @param integer		$code		The Exception code.
+	 */
+	public function __construct($message = "", $filename = '', $parameters = array(), \Exception $previous = null, $code = 0)
+	{
+		parent::__construct($message, array_merge(array('filename' => $filename), $parameters), $previous, $code);
+	}
+
+	/**
+	 * Returns the filename that triggered the error
+	 *
+	 * @return string
+	 */
+	public function get_filename()
+	{
+		$parameters = parent::get_parameters();
+		return $parameters['filename'];
+	}
+}