Add JsonSerializer.ParseID with return value

Source/Engine/Serialization/JsonSerializer.cs

@@ -368,6 +368,17 @@ namespace FlaxEngine.Json
             return GetStringID(&id);
         }
 
+        /// <summary>
+        /// Parses the given object identifier represented in the internal serialization format.
+        /// </summary>
+        /// <param name="str">The ID string.</param>
+        /// <returns>The identifier.</returns>
+        public static Guid ParseID(string str)
+        {
+            ParseID(str, out var id);
+            return id;
+        }
+
         /// <summary>
         /// Parses the given object identifier represented in the internal serialization format.
         /// </summary>