Initial board state and tile info data setup, unit tests for board setup / serializer

Framework for the full tile type color matching, but it's all data structures and validating the structure

Assets/Runtime/Extensions/RandomFromArray.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// Helper method for randomly rolling from a generic array
+public static class RandomFromArray {
+	public static T GetRandom<T>(this T[] array) {
+		return array[Random.Range(0, array.Length)];
+	}
+}

Assets/Runtime/Extensions/RandomFromArray.cs.meta

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