Say I am testing and editing a map ongoing, so I play a while and say I want to maybe add more rivers in a certain area and then maybe more hills in another, is it possible to add them in the ongoing game and then they will show up in the map if I were to start a new game with same map, but whereas it may be 400 BC when I alter the map, say I want to restart the game after an alteration is made to the ongoing game, would this be saved to the created map so it shows when I start a new game?