It’s hard to picture Dublin Oldschool on the stage. Emmet Kirwan’s 2015 poem-play of the same name, which ran at the National Theatre and won the Stewart Parker award, finds rushing, thumping life on screen, with Kirwan staying on to screenwrite and star, joined by first-time feature director (and co-writer) Dave Tynan. Set free from its theatrical box, Oldschool is a film that never sits still for long. Set over the course of one druggy, downey, uppey bank holiday weekend in the Irish capital, Dublin Oldschool has a compellingly mobile energy. It snakes through Dublin’s streets and backalleys, across its…