Simple like / unlike star which works in async fashion. Provide controller methods for saving the like & unlike (these functions should have $this->no_output = true; set in order not to make the clien refresh.
|$liked||1 or 2 whether the item is liked or not|
|$action_like||Full path, ie Controller/like/$id|
|$action_unlike||Full path, ie Controller/unlike/$id|