© Schubert, ROW Pictures, Walker+Worm Film & Gerald Kerkletz They say casting is everything. Before Austrian filmmaker Markus Schleinzer sat in the director’s chair, he spent years as a casting director for auteurs like Michael Haneke, helping cast “The Piano Teacher” (2001) and “The White Ribbon” (2009), films full of astonishing performances. That eye for talent hasn’t left him….