Colin Firth had been hoping for decades to get a call from Woody Allen. Emma Stone, at only 25, hadn’t been waiting nearly as long — but she notes her family dog IS named Alvy, after a classic Allen character, and she can keep up with Firth in a spontaneous recounting of the bank robbery scene in “Take the Money and Run.” The two stars of “Magic in the Moonlight,” opening Friday, were both working for the first time with Allen, and they sat down recently to recount what it was like.