The convex hull tests included a reference AABB-fitting function for
comparison which was used to validate the optimized implementation.
This wasn't great as it depended on matching exact return values and
didn't test the logic of AABB-fitting worked usefully.
Replace this with a more general test that creates random polygons with
known bounds, apply a random rotation & translation, then use
AABB-fitting to un-rotate the points, passing when the bounds are no
larger than the size of the generated input.
Details:
- Make BLI_convexhull_aabb_fit_hull_2d a static function again as it was
only exposed for tests. Use BLI_convexhull_aabb_fit_points_2d instead.
- Remove brute force reference implementation from tests,
moving this to an assertion within convexhull_2d
(disabled by default since it's quite slow).
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