Everything another package needs to put props, vehicles and people into a settlement. JSON-safe.
Architecture.
Buildings.
Centre (frame-local).
A farmstead's yard, fields (corn ones for a crop renderer), tractor spots and props; null for other settlements.
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Lots.
Estimated residents.
Radius, metres.
Road network.
Street layout.
Everything another package needs to put props, vehicles and people into a settlement. JSON-safe.