Oasis, the Britpop band known for timeless hits like “Wonderwall” and “Don’t Look Back in Anger,” is reuniting for a tour of the British Isles next summer. Oasis, the Britpop band known for timeless hits like “Wonderwall” and “Don’t Look Back in Anger,” is reuniting for a tour of the British Isles next summer, ending a 15-year hiatus and, presumably, …