Add earcut to PG stable

Playground/indexStable.html

@@ -35,7 +35,8 @@
         <script src="js/libs/fileSaver.js"></script>
         <!-- Physics -->
         <script src="https://cdn.babylonjs.com/cannon.js"></script>
-        <script src="https://cdn.babylonjs.com/Oimo.js"></script>
+        <script src="https://cdn.babylonjs.com/Oimo.js"></script>        
+        <script src="https://preview.babylonjs.com/earcut.min.js"></script>
         <!-- Monaco -->
         <script src="node_modules/monaco-editor/min/vs/loader.js"></script>
         <!-- Babylon.js -->