Merge VS Code 1.21 source code (#1067)

* Initial VS Code 1.21 file copy with patches

* A few more merges

* Post npm install

* Fix batch of build breaks

* Fix more build breaks

* Fix more build errors

* Fix more build breaks

* Runtime fixes 1

* Get connection dialog working with some todos

* Fix a few packaging issues

* Copy several node_modules to package build to fix loader issues

* Fix breaks from master

* A few more fixes

* Make tests pass

* First pass of license header updates

* Second pass of license header updates

* Fix restore dialog issues

* Remove add additional themes menu items

* fix select box issues where the list doesn't show up

* formatting

* Fix editor dispose issue

* Copy over node modules to correct location on all platforms

build/gulpfile.mixin.js

@@ -6,9 +6,21 @@
 'use strict';
 
 const gulp = require('gulp');
+const json = require('gulp-json-editor');
+const buffer = require('gulp-buffer');
+const filter = require('gulp-filter');
+const es = require('event-stream');
+const util = require('./lib/util');
+const remote = require('gulp-remote-src');
+const zip = require('gulp-vinyl-zip');
+const assign = require('object-assign');
+
 // {{SQL CARBON EDIT}}
 const jeditor = require('gulp-json-editor');
 
+// @ts-ignore Microsoft/TypeScript#21262 complains about a require of a JSON file
+const pkg = require('../package.json');
+
 gulp.task('mixin', function () {
   // {{SQL CARBON EDIT}}
 	const updateUrl = process.env['SQLOPS_UPDATEURL'];