[WIP] Introduce manhatten distance for city clearances#15

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Philiquaz wants to merge 3 commits intomaxpetul:masterfrom

Philiquaz:mindist

Commits on Nov 17, 2025

[WIP] Introduce manhatten distance for city clearance, promote foreign city rule to its own set of clearance metrics.
Philiquaz
committed
Adjust search box size to be in same coord units
Philiquaz
committed
Fix behaviour off by 1 and intersection logic. Remove additional shortcut that sometimes doesn't apply.
Philiquaz
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