PuzzleMeasurement, add Realm, door ExitedFrom event

Assets/Engine/Runtime/Measurements/Puzzle.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using System.Linq;
+using EscapeRoomEngine.Engine.Runtime.Modules;
+using EscapeRoomEngine.Engine.Runtime.Utilities;
+using JetBrains.Annotations;
+using Realms;
+
+namespace EscapeRoomEngine.Engine.Runtime.Measurements
+{
+    public class Puzzle : RealmObject
+    {
+        [PrimaryKey]
+        public int ID { get; set; }
+        public IList<PuzzleMeasurement> Measurements { get; }
+
+        public float TotalTimeSpentOnPuzzle => Measurements.Sum(measurement => measurement.Time);
+        public float AverageTimeToSolve => Measurements.Count > 0 ? TotalTimeSpentOnPuzzle / Measurements.Count : 0f;
+        
+        [UsedImplicitly]
+        public Puzzle() {}
+        public Puzzle(PuzzleModuleDescription puzzle)
+        {
+            ID = puzzle.Id;
+        }
+
+        public override string ToString()
+        {
+            return $"{Engine.DefaultEngine.theme.GetPuzzle(ID)}: avg. {AverageTimeToSolve.ToTimeSpan():m':'ss} ({string.Join(", ", Measurements)})";
+        }
+    }
+}