move puzzle implementations out of engine

Assets/Engine/Runtime/Utilities/Orientation.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+
+namespace EscapeRoomEngine.Engine.Runtime.Utilities
+{
+    public enum Orientation
+    {
+        North = 0, East = 90, South = 180, West = 270
+    }
+
+    public static class OrientationExtensions
+    {
+        public static HashSet<Orientation> EveryOrientation() => new(new[]
+        {
+            Orientation.North, Orientation.East, Orientation.South, Orientation.West
+        });
+
+        /// <summary>
+        /// Return the orientation corresponding to an angle, starting at 0 degrees North and going clockwise around the compass.
+        /// </summary>
+        public static Orientation FromAngle(int angle) => (Orientation)angle;
+
+        /// <summary>
+        /// Turn an orientation into its corresponding angle.
+        /// </summary>
+        public static float Angle(this Orientation orientation) => (float)orientation;
+
+        /// <summary>
+        /// Turn an orientation into its corresponding angle.
+        /// </summary>
+        public static int AngleInt(this Orientation orientation) => (int)orientation;
+
+        /// <summary>
+        /// Rotate an orientation by a specific amount of quarter rotations. Rotating <c>East</c> thrice would return <c>North</c>.
+        /// </summary>
+        public static Orientation Rotated(this Orientation orientation, int quarterRotations) =>
+            orientation + quarterRotations * 90;
+    }
+}