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/promise.ts

@@ -2,7 +2,6 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
-'use strict';
 
 /**
  * Deferred promise
@@ -23,4 +22,4 @@ export class Deferred<T> {
 	then<TResult>(onfulfilled?: (value: T) => TResult | Thenable<TResult>, onrejected?: (reason: any) => TResult | Thenable<TResult> | void): Thenable<TResult> {
 		return this.promise.then(onfulfilled, onrejected);
 	}
-}
+}