One of the best reactions from an audience in a cinema that I’ve witnessed recently was for a film that won’t even be released for another year, Shrek 5, and really, there was one driving reason for that excitement during the trailer: Eddie Murphy. Because much as people love Shrek, and Mike Myers’ bizarre appropriation of whatever Scottish dialogue he’s attempting, and much as they love that whole day-glo swamp world and far, far, away, it’s o…