Strict Null Checks, Builder Removal, Formatting (#4849)

* remove builder; more null checks

* null checks

* formatting

* wip

* fix dropdown themeing

* formatting

* formatting

* fix tests

* update what files are checked

* add code to help refresh bad nodes

src/sql/base/common/objects.ts

@@ -2,7 +2,7 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
-'use strict';
+
 import * as Types from 'vs/base/common/types';
 
 export function clone<T>(obj: T): T {