BoundaryCheck is slow for aligned box checks (was ACTS-479)

Original author Paul Gessinger-Befurt @pagessin

If the fast isInside check fails, BoundaryCheck resorts to the full blown projection onto a polygon (with 4 sides) and lots of projections using the covariance matrix, even if it's unity.

Edited Mar 27, 2019 by Moritz Kiehn

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