Bug - Building gate on wall foundations should return resources

This bug functions similarly in case of both stone and wood (palisade) walls.

If 4 pieces of wall foundations are placed side-by-side, then if gate foundation is placed on them, then 2 inner pieces of wall foundations are automatically deleted without returning resources spent on them (can check this by deleting gate foundation).

If gate gets completely built, then 2 outer pieces of wall foundations are automatically deleted without returning resources spent on them (can check by deleting gate).

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SOTL also talks about this - https://youtu.be/0NtNFq9ihoU

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I have always worked around this bug by deleting wall foundations before placing gate foundation on them, so I get my resources back. But this is cumbersome to do.

I know that this bug has existed for a long time (even in original AoC), but it is time to finally fix this.

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I propose that when placing building foundation on existing building foundation, then that existing building foundation is automatically properly deleted, so that resources are returned. For example when placing gate foundation on 4 stone wall foundations, then wall foundations will be deleted and 20 (4*5) stone returned to the player.

This would work for wall+gate case and for any other possible case ever occurring for this kind of situation.