Insanely huge initial commit

Assets/Extensions/AstarPathfindingProject/Utilities/AstarChecksum.cs

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+using System;
+namespace Pathfinding.Util {
+	/// <summary>Calculates checksums of byte arrays</summary>
+	public class Checksum {
+		/// <summary>
+		/// Calculate checksum for the byte array starting from a previous values.
+		/// Useful if data is split up between several byte arrays
+		/// </summary>
+		public static uint GetChecksum (byte[] arr, uint hash) {
+			// Sort of implements the Fowler–Noll–Vo hash function
+			const int prime = 16777619;
+
+			hash ^= 2166136261U;
+
+			for (int i = 0; i < arr.Length; i++)
+				hash = (hash ^ arr[i]) * prime;
+
+			return hash;
+		}
+	}
+}