LoadScene uses variables

Assets/Fungus/Flowchart/Scripts/Commands/LoadScene.cs

@@ -1,4 +1,5 @@
 using UnityEngine;
+using UnityEngine.Serialization;
 using System;
 using System.Collections;
 
@@ -11,33 +12,53 @@ namespace Fungus
 		"usage. Previously loaded assets will be released before loading the scene to free up memory." +
 		"The scene to be loaded must be added to the scene list in Build Settings.")]
 	[AddComponentMenu("")]
-	public class LoadScene : Command 
+	public class LoadScene : Command, ISerializationCallbackReceiver 
 	{
+		#region Obsolete Properties
+		[HideInInspector] [FormerlySerializedAs("sceneName")] public string sceneNameOLD;
+		#endregion
+
 		[Tooltip("Name of the scene to load. The scene must also be added to the build settings.")]
-		public string sceneName = "";
+		public StringData _sceneName = new StringData("");
 
 		[Tooltip("Image to display while loading the scene")]
 		public Texture2D loadingImage;
 
 		public override void OnEnter()
 		{
-			SceneLoader.LoadScene(sceneName, loadingImage);
+			SceneLoader.LoadScene(_sceneName.Value, loadingImage);
 		}
 
 		public override string GetSummary()
 		{
-			if (sceneName.Length == 0)
+			if (_sceneName.Value.Length == 0)
 			{
 				return "Error: No scene name selected";
 			}
 
-			return sceneName;
+			return _sceneName;
 		}
 
 		public override Color GetButtonColor()
 		{
 			return new Color32(235, 191, 217, 255);
 		}
+
+		//
+		// ISerializationCallbackReceiver implementation
+		//
+
+		public virtual void OnBeforeSerialize()
+		{}
+
+		public virtual void OnAfterDeserialize()
+		{
+			if (sceneNameOLD != default(string))
+			{
+				_sceneName.Value = sceneNameOLD;
+				sceneNameOLD = default(string);
+			}
+		}
 	}
 
 }

Assets/Fungus/Flowchart/Scripts/Commands/OpenURL.cs

@@ -11,18 +11,18 @@ namespace Fungus
 	public class LinkToWebsite : Command
 	{
 		[Tooltip("URL to open in the browser")]
-		public string url;
+		public StringData url = new StringData();
 
 		public override void OnEnter()
 		{
-			Application.OpenURL(url);
+			Application.OpenURL(url.Value);
 
 			Continue();
 		}
 
 		public override string GetSummary()
 		{
-			return url;
+			return url.Value;
 		}
 
 		public override Color GetButtonColor()