Add DirectedHausdorffDistance class

[dr-jts]

Adds the DirectedHausdorffDistance class, and supporting code. It computes the directed Hausdorff distance (and thus the Hausdorff distance) to any desired accuracy. It has the following features:

• uses a fast branch-and-bound algorithm with lazy densification
• where the distance occurs at a non-vertex, computes the result to a given distance tolerance
• can compute distance tolerance automatically, providing a "magic-number-free" API
• supports any combination of points, lines, and polygons (and allows the Hausdorff distance to be determined at interior points of polygons)
• provides prepared mode execution (caching computed indexes)
• provides a isFullyWithinDistance predicate to test whether the directed Hausdorff distance meets a given limit, with short-circuiting used to improve performance for repeated queries
• provides fast performance for topologically equal geometries, and ones with very small distances

This essentially replaces the DiscreteHausdorffDistance class.

For more details see blog post.