novnc ES6 compatibility is not working. I reverse it. Spice/VNC sending ctrl+alt+fn functionality restored.

static/js/novnc/vendor/browser-es-module-loader/src/babel-worker.js

@@ -0,0 +1,23 @@
+/*import { transform as babelTransform } from 'babel-core';
+import babelTransformDynamicImport from 'babel-plugin-syntax-dynamic-import';
+import babelTransformES2015ModulesSystemJS from 'babel-plugin-transform-es2015-modules-systemjs';*/
+
+// sadly, due to how rollup works, we can't use es6 imports here
+var babelTransform = require('babel-core').transform;
+var babelTransformDynamicImport = require('babel-plugin-syntax-dynamic-import');
+var babelTransformES2015ModulesSystemJS = require('babel-plugin-transform-es2015-modules-systemjs');
+
+self.onmessage = function (evt) {
+    // transform source with Babel
+    var output = babelTransform(evt.data.source, {
+      compact: false,
+      filename: evt.data.key + '!transpiled',
+      sourceFileName: evt.data.key,
+      moduleIds: false,
+      sourceMaps: 'inline',
+      babelrc: false,
+      plugins: [babelTransformDynamicImport, babelTransformES2015ModulesSystemJS],
+    });
+
+    self.postMessage({key: evt.data.key, code: output.code, source: evt.data.source});
+};