Who said playing support was easy? In an awards season overflowing with frontrunners and over-analyzed narratives, it’s not best picture or lead actor that’s stirring the pot the most. Instead, the two supporting actor categories have become the season’s most unpredictable races. Starting with supporting actress, 75-year-old veteran Amy Madigan has dominated critics’ prizes for her chilling turn in the psychological horror film “Weapons,” yet she remains an island unto herself. Her film