issue #2405 update smarty

and made Piwigo compatible with smarty 5.x

include/smarty/src/Template/Config.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Smarty\Template;
+
+use Smarty\Smarty;
+use Smarty\Template;
+use Smarty\Exception;
+
+/**
+ * Smarty Config Resource Data Object
+ * Metadata Container for Config Files
+ *
+ * @author     Uwe Tews
+ */
+class Config extends Source {
+
+	/**
+	 * Flag that source is a config file
+	 *
+	 * @var bool
+	 */
+	public $isConfig = true;
+
+	/**
+	 * @var array
+	 */
+	static protected $_incompatible_resources = ['extends' => true];
+
+	public function createCompiler(): \Smarty\Compiler\BaseCompiler {
+		return new \Smarty\Compiler\Configfile($this->smarty);
+	}
+
+	protected static function getDefaultHandlerFunc(Smarty $smarty) {
+		return $smarty->default_config_handler_func;
+	}
+}