'Cinderella: The Remix' is set to the hip beat of modern times
An old-school fairy godmother might float serenely to a protégée's rescue, waving a magic wand. Not so for the supernatural fixer of "Cinderella: The Remix," the clever children's musical now at Imagination Stage. Hoperah, as this enchantress is named, bounds boisterously into action, armed with a glittery TV talk-show mike. Then she vaunts her own prowess in a brash rap sequence: "I can do anything I please," she …