Kenneth Lonergan '84 won the Oscar for Best Original Screenplay for Manchester by the Sea at last night's Academy of Motion Picture Arts and Sciences awards ceremony, while Casey Affleck took home the Actor in a Leading Role award for his part in the film. Lonergan wrote and directed Manchester by the Sea, which also received nominations in the film, director (Lonergan), actress in a supporting role and actor in a supporting role categories. Jennifer Lame ’04 served as film editor for Manchester by the Sea. Other Wesleyan alumni receiving nominations this year included Lin-Manuel Miranda '02, Hon. '15., for Best Original Song for…