message: RequestEngineExit() replaces deprecated global flag
diff: @@ -413,7 +413,9 @@ class Vehicle {
  void Tick(float DeltaSeconds)
  {
  // Quit on ESCape key
  - if (hitKey(EKeys::Escape)) GIsRequestingExit = true;
  + if (hitKey(EKeys::Escape)) {
  + RequestEngineExit("User hit ESC");
  + }
  // Run the game if a map has been selected
  if (_mapSelected) {
  