A legendary comedy player of TV "Golden Age" and occasional films, Sid Caesar and his "Your Show of Shows" set the standard on which all future TV sketch comedy was judged and from which all TV sketch comedy has evolved. Tall, somewhat comic-looking, but with burly shoulders and, unlike many other comics who seem like weaklings, a physically powerful man, Caesar was one of the top TV stars of the 1950s before changing public tastes, plus his own well- documented addiction to scotch and barbiturates plunged him into two decades of career decline. It took "Grease", the 1978 film musical to