Switch to DelaunayTriangulation.Naive

Per https://github.com/noinia/hgeometry/issues/28, occasionally
DelaunayTriangulation.DivideAndConquer loops infinitely - in this case,
I was able to consistently use the seed 127624940715530481, to generate
a dungeon which had the following room centroids:

    [ Point2 [38.5,3.5] :+ 0
    , Point2 [67.0,33.0] :+ 1
    , Point2 [46.0,45.5] :+ 2
    , Point2 [55.5,42.0] :+ 3
    , Point2 [36.0,25.0] :+ 4
    , Point2 [76.5,12.0] :+ 5
    , Point2 [29.0,26.5] :+ 6
    , Point2 [55.0,10.5] :+ 7
    ]

and cause delaunay triangulation to loop indefinitely (or at least
longer than I cared to wait for). Given the size of our graphs switching
to naive generation should be fine performance-wise, and avoids the
infinite loop.

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