Set AVAudioSession, disable screensaver during playback on macOS

macOS/AppDelegate.swift

@@ -5,4 +5,8 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     func applicationShouldTerminateAfterLastWindowClosed(_: NSApplication) -> Bool {
         true
     }
+
+    func applicationWillTerminate(_: Notification) {
+        ScreenSaverManager.shared.enable()
+    }
 }