[ACA-1646] "dev tools" extension (#567)

* dev tools extension project

* code editor integration

* latest editor, offline setup

* override extension config (session only)

* schema support

* wire external plugins with experimental flag

* update package scripts

* sidebar extensions scaffold

* propagate extension tabs to info drawer

* separate tab components for info drawer

* extensibility for info drawer

* support tab icons

src/polyfills.ts

@@ -95,3 +95,38 @@ import 'zone.js/dist/zone';  // Included with Angular CLI.
  * Need to import at least one locale-data with intl.
  */
 // import 'intl/locale-data/jsonp/en';
+
+// workaround for https://github.com/Microsoft/monaco-editor/issues/790
+
+Promise.all = function(values: any): Promise<any> {
+  let resolve: (v: any) => void;
+  let reject: (v: any) => void;
+  const promise = new this((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  let count = 0;
+  let index = 0;
+  const resolvedValues: any[] = [];
+  for (let value of values) {
+    if (!(value && value.then)) {
+      value = this.resolve(value);
+    }
+    value.then(
+      (idx => (val: any) => {
+        resolvedValues[idx] = val;
+        count--;
+        if (!count) {
+          resolve(resolvedValues);
+        }
+      })(index),
+      reject
+    );
+    count++;
+    index++;
+  }
+  if (!count) {
+    resolve(resolvedValues);
+  }
+  return promise;
+};