Fernando Botero, the Colombian whose voluptuous pictures and sculptures of overstuffed generals, bishops, prostitutes, housewives and other products of his whimsical imagination made him one of the world’s best-known artists, died on Friday in Monaco. Mr. Botero was permanently associated with the florid, rounded figures that filled his pictures. He portrayed middle-class life and bordellos, clerics and peasants, bulging baskets of fruit and the grim effects of violence.