Migrate app to TypeScript (#1637)

* Initial setup and migrated src/common

* WIP

* WIP

* WIP

* Main module basically finished

* Renderer process migrated

* Added CI step and some fixes

* Fixed remainder of issues and added proper ESLint config

* Fixed a couple issues

* Progress!

* Some more fixes

* Fixed a test

* Fix build step

* PR feedback

scripts/check_build_config.js

@@ -1,7 +1,7 @@
 // Copyright (c) 2015-2016 Yuya Ochiai
 // Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
-const buildConfig = require('../src/common/config/buildConfig');
+const buildConfig = require('../dist/buildConfig');
 
 function validateBuildConfig(config) {
     if (config.enableServerManagement === false && config.defaultTeams && config.defaultTeams.length === 0) {