fix: Make orientation for open office consistent

[serenayl]

If edges are all roughly the same length, fall back to the first one to determine orientations

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This change is 

[andrewheumann]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: 1 of 1 approvals obtained, 1 unresolved discussion (waiting on @serenayl)

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LayoutFunctions/LayoutFunctionCommon/WallGeneration.cs line 643 at r1 (raw file):

            // If all the edges are essentially equal, use the first one.
            // TODO: use a real orientation when it becomes part of the data.
            if (edgesOrderedByLength.Last().Length - edgesOrderedByLength.First().Length < Vector3.EPSILON)

very minor — we can use minSeg instead of edgesOrderedByLength.Last() here to avoid double-enumeration.