Clint Eastwood may be to many casual filmgoers the gun-toting authoritarian Harry Callahan from the “Dirty Harry” movies, or perhaps the man with no name from Sergio Leone’s spaghetti westerns, or more recently Frankie Dunn in “Million Dollar Baby. He’s an iconic Hollywood figure who has embodied some of the world’s most recognisable characters in many of the most prominent films of the last fifty years. But he’s also as accomplished behind the camera as he is in front of it, directing such classics as “Play Misty For Me”, “The …