Add Polygon.IntersectionLines for Polygons not on the same plane

[DmytroMuravskyi]

BACKGROUND:

• There is a request for Surface to Surface intersections Add Intersect method for Surfaces #110
• It was clarified that focus is the case when two polygons are not sharing the plane as other cases are already covered:
  a) Polygon.Intersects(Polygon) returns list of intersection vertices for any two polygons.
  b) Polygon.Intersection(Polygon) returns list of Polygons for two polygons that share a plane.

DESCRIPTION:

• This PR adds List<Line> IntersectionLines(Polygon polygon, bool includeIntersectionAtEdge = false) function that expects two polygons that not share a plane.
• If two polygons are on the same plane - empty list is always returned.
• If two polygons only touching - it depends on includeIntersectionAtEdge parameter.

TESTING:

• IntersectionLines is added to PolygonTests.

REQUIRED:

• All changes are up to date in CHANGELOG.md.

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This change is 

[wynged]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained

[wynged]

Reviewed 3 of 3 files at r2, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained