Tested new implementation for models

Assets/MediaPipeUnity/Scripts/ModelTuple.cs

@@ -0,0 +1,18 @@
+using System;
+using UnityEngine;
+using Unity.Barracuda;
+/// <summary>
+/// Small class to link a model to a courseIndex irrespective of its position in a list
+/// </summary>
+[Serializable]
+public class ModelTuple
+{
+    /// <summary>
+    /// ModelIndex to which the model corresponds
+    /// </summary>
+    public ModelIndex index;
+    /// <summary>
+    /// The model itself
+    /// </summary>
+    public NNModel model;
+}