* Make dtClosestHeightPointTriangle use no epsilon (except for checking
denominator)
* When point is outside poly, directly find closest height from boundary
detail edges instead of first interpolating and then finding height from
detail tris.
* When point is inside poly, if all dtClosestHeightPointTriangle queries
failed, then find height from detail edges. This should only happen if
the point is right on top of an internal detail tri edge.
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