Added support for saving XML files!

Support for binary files will be coming later.

Tree/Instance.cs

@@ -12,11 +12,11 @@ namespace RobloxFiles
     public class Instance
     {
         /// <summary>The ClassName of this Instance.</summary>
-        public readonly string ClassName;
+        public string ClassName;
 
         /// <summary>A list of properties that are defined under this Instance.</summary>
         public Dictionary<string, Property> Properties = new Dictionary<string, Property>();
-        
+
         private List<Instance> Children = new List<Instance>();
         private Instance rawParent;
 
@@ -24,6 +24,8 @@ namespace RobloxFiles
         public string Name => ReadProperty("Name", ClassName);
         public override string ToString() => Name;
 
+        internal string XmlReferent;
+
         /// <summary>Creates an instance using the provided ClassName.</summary>
         /// <param name="className">The ClassName to use for this Instance.</param>
         public Instance(string className = "Instance")
@@ -292,7 +294,7 @@ namespace RobloxFiles
         /// This is used during the file loading procedure.
         /// </summary>
         /// <param name="prop">A reference to the property that will be added.</param>
-        public void AddProperty(ref Property prop)
+        internal void AddProperty(ref Property prop)
         {
             Properties.Add(prop.Name, prop);
         }

Tree/Property.cs

@@ -33,7 +33,7 @@ namespace RobloxFiles
         PhysicalProperties,
         Color3uint8,
         Int64,
-        SharedString
+        SharedString,
     }
 
     public class Property
@@ -44,7 +44,9 @@ namespace RobloxFiles
         public PropertyType Type;
         public object Value;
 
+        public string XmlToken = "";
         private byte[] RawBuffer = null;
+
         public bool HasRawBuffer
         {
             get