Callback: Disable autosloping

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Disable autosloping (3C/14F/15D)

With this callback, you can prevent the autoslope feature from altering the ground below a house/industry/object tile. To allow altering the ground, return 0. Returning 1 will disallow land modifications.

GRFv≤7 Note that GRF versions 7 and lower only distinguished zero and non-zero return values.