Diagonal Digging Denied

Makes digging diagonal/checkerboard tunnels impossible through most means.
If a tile is dug out, and there is an open tile diagonal to it that can ONLY be accessed diagonally, one of the two orthogonal walls shared by the tiles in question will automatically also be dug out if possible.
This will make it more difficult to force 1v1 encounters with enemies by digging checkerboard tunnels to minimise field of view.

Should be compatible with most addons, but may not affect digging methods introduced in said addons.

tome-no_diagonal_dig.teaa