PuzzleMeasurement, add Realm, door ExitedFrom event

Assets/Engine/Runtime/Measurements/PuzzleMeasurement.cs

@@ -1,15 +1,18 @@
-using System;
-using System.IO;
-using System.Runtime.Serialization.Formatters.Binary;
+using EscapeRoomEngine.Engine.Runtime.Utilities;
+using Realms;
 
 namespace EscapeRoomEngine.Engine.Runtime.Measurements
 {
-    [Serializable]
-    public struct PuzzleMeasurement
+    public class PuzzleMeasurement : EmbeddedObject
     {
-        public void a()
+        public float TimeStarted { get; set; }
+        public float TimeSolved { get; set; }
+
+        public float Time => TimeSolved - TimeStarted;
+
+        public override string ToString()
         {
-            new BinaryFormatter().Serialize(new MemoryStream(), this);
+            return $"{Time.ToTimeSpan():m':'ss}";
         }
     }
 }