datasketches-cpp-3.1.0

• Kolmogorov-Smirnov test for KLL sketch
• custom seed support in Theta Jaccard similarity
• Theta union bug fix
• added get_max_serialized_size_bytes method for KLL and CPC sketches
• added wrapped_compact_theta_sketch to avoid some cost of deserialization
• massive code cleanup to avoid compiler warnings
• iterator fix in KLL sketch
• iterator fix in REQ sketch
• exception safety fix in theta_update_sketch_base
• misaligned access fix in MurmurHash3