High Society, at The Mill at Sonning until January 20 Review by DEREK ANSELL Famous as two Hollywood films, this play appeared first as The Philadelphia Story, a 1930s movie with Katherine Hepburn. Most famously though, it was produced as High Society, a 1956s film with Bing Crosby, Grace Kelly, Frank Sinatra and the Louis Armstrong All Stars. Director Joe Pitcher’s sparkling production here appears to have taken scenes and dialogue from both films, added extras, and even fleshed out the Cole Porter songs written for the film with a few extra gems from the composer. Everything comes together h…