King Charles 111 **** ------ Sylvia **1/2 - On Your Feet **1/2
                 By: David ShewardTim Pigott-Smith: "King Charles 111"Three recent openings offer examples of the most prevalent types of Broadway shows: the British snob hit (King Charles III), the star-vehicle revival (Sylvia), and the jukebox musical, Lifetime-TV bio pic subdivision (On Your Feet!). The first is perfection and the latter two have their share of f…