Commit a955c32c

hide walls that have a used tile behind them, depending on the angle of the camera

Besides the set the walls to be “always up” and “always down” add a third mode, that automatically puts the walls down if they are on the “inside” of a building. The overly simple method to determine this is if a tile that is not just ground/grass is behind that piece of wall – depending on the camera angle looking at it:

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