incorporate ArrayBuffer base Dish type. Add global file shim to node index. Fix Buffer -> ArrayBuffer transformation

src/node/config/scripts/generateNodeIndex.mjs

@@ -41,6 +41,7 @@ let code = `/**
 import "babel-polyfill";
 import NodeDish from "./NodeDish";
 import { _wrap, help, bake, _explainExludedFunction } from "./api";
+import File from "./File";
 import {
     // import as core_ to avoid name clashes after wrap.
 `;
@@ -53,6 +54,8 @@ includedOperations.forEach((op) => {
 code +=`
 } from "../core/operations/index";
 
+global.File = File;
+
 // Define global environment functions
 global.ENVIRONMENT_IS_WORKER = function() {
     return typeof importScripts === "function";