Compute position of HalfEdges start vertex
#1635
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Add
HalfEdge::start_position, which computes the position of theHalfEdge's start vertex. Update most code to use that method instead, instead ofSurfaceVertex::position. This is preparation for eventually removingSurfaceVertex::position, and thenSurfaceVertexas a whole.Most of the remaining uses of the
SurfaceVertex::positionare fairly trivial and can be removed when thepositionfield is removed. The only tricky case isPartialSurfaceVertex, which still needsSurfaceVertex::positionto be around, while it itself stores a surface position. Addressing this will be subject to follow-up pull requests.This is a step towards addressing #1634.