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This PR rewrites Overlay.swift to be more idiomatic.
Overlay is now a protocol and its subclasses are now structs. Moved all string construction into interpolated strings in description properties. Marker and CustomMarker share a Point protocol. Renamed MarkerSize to Size and placed it under Marker. Restricted
Marker.label
to a new Label type that can be a Character, Int, or String. Assertions ensure valid values (although they can’t ensure valid Maki names). RenamedGeoJSON(string:)
toGeoJSON(objectString:)
and added aGeoJSON(object:)
that takes structured data.Added documentation throughout Overlay.swift.