Smarty Extended class update

Move all smarty and path settings into the Smarty Extended class

the include files <admin|frontend>_set_paths.php and <admin|frontend>_smarty.php

are deprecated.

For special frontend smarty (which will be not used in future anyway) a
dedicated sub class to Smarty Extended with its own methods should be
created

www/configs/config.master.php

@@ -274,6 +274,7 @@ foreach ($paths as $path) {
 		DEFINE('CONVERT', $path.DS.'convert');
 	}
 }
+unset($paths);
 
 /************* DEBUG *******************/
 // turn off debug if debug flag is OFF