In Norman Jewison’s delightfully eccentric MOONSTRUCK, the concept of love to our cast of characters is an idea that is equal parts revolting, magical, and unattainable — at least in love’s “pure” form: you know, the love that makes you break into song or dance or hold a stereo over your head as you blast Peter Frampton outside your crushes’ window. For Loretta Castorini (Cher), love might as well be a few inches away from being a curse. A widow of two…