Audio emitter implementation in the KHR_Interactivity branch

Editor/Scripts/Interactivity/VisualScriptingExport/ExportGraph.cs

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+using System.Collections;
+using System.Collections.Generic;
+using Unity.VisualScripting;
+using UnityEngine;
+
+using UnityGLTF.Interactivity.VisualScripting.Export;
+
+namespace UnityGLTF.Interactivity
+{ 
+    /// <summary>
+    /// Graph containing exporter nodes for use by the interactivity and audio contexts
+    /// </summary>
+    public class ExportGraph
+    {
+        public GameObject gameObject = null;
+        public ExportGraph parentGraph = null;
+        public FlowGraph graph;
+        public Dictionary<IUnit, UnitExporter> nodes = new Dictionary<IUnit, UnitExporter>();
+        internal Dictionary<IUnitInputPort, IUnitInputPort> bypasses = new Dictionary<IUnitInputPort, IUnitInputPort>();
+        public List<ExportGraph> subGraphs = new List<ExportGraph>();
+    }
+}