introduce Smarty::$resource_cache_mode and cache template object of {include} inside loop

libs/sysplugins/smarty_internal_templatecompilerbase.php

@@ -319,6 +319,13 @@ abstract class Smarty_Internal_TemplateCompilerBase
      */
     public $variable_filter_stack = array();
 
+    /**
+     * Loop nesting count
+     *
+     * @var int
+     */
+    public $loopNesting = 0;
+
     /**
      * Strip preg pattern
      *