/**
  * This funciton initializes the api property for easy access to the plugin
  * API. This function is *only* called by MS_Controller_Api::__construct()!
  *
  * @since  1.0.0
  * @internal
  * @param MS_Controller_Api $controller The initialized API controller.
  */
 public static function set_api($controller)
 {
     self::$api = $controller;
 }