Free Hero Mesh

  nobjects=0;
  free(objects);
  objects=0;
  gameover=0;
}

const char*execute_turn(int key) {
  // Set key=0 for initialization
  if(setjmp(my_env)) return my_error;
  changed=0;
  key_ignored=0;
  lastimage_processing=0;
  vstackptr=0;
  
  if(key_ignored && changed) return "Invalid use of IgnoreKey";