“The world may or may not be without purpose. But it isn’t without a bit of magic.” Woody Allen’s latest is as light and airy as a meringue. And as delightful, too. Perhaps because I went in not expecting much (given its mixed reviews), I found Magic in the Moonlight quite charming, indeed (despite that awful poster!). Everything I expected to put me off – the story, the casting, the acting – won me over in the end. Colin Firth, channeling his long-lost Darcy in his more charming moments, is Stanley Crawford, a rigid, logical man of a certain age who happens to be one of the world’s best known magicians (it’s…