Behold a Broadway musical that sings, dances and bedazzles so magnetically, it feels as if it were ordained for the screen by divine providence. "Roald Dahl's Matilda: The Musical" certainly is divine, but the inspirational figures are all mortal: a director, Matthew Warchus; a star, Emma Thompson; and a cast of perpetually whirling child wonders who propel the story forward with kinetic enchantment.