ApplicationServices.Polygon when imported interferes with our Polygon.

[tonystone]

When Apple ApplicationServices is imported either directly or indirectly (XCTest imports it indirectly) code using GeoFeatures can not resolve our Polygon. We get the following messages. We need to decide how or if we handle this edge case.

error: 'Polygon' is ambiguous for type lookup in this context

ApplicationServices.Polygon:1:18: note: found this candidate
public typealias Polygon = MacPolygon
                 ^
GeoFeatures.Polygon:1:15: note: found this candidate
public struct Polygon : Geometry, Surface {
              ^