Es6 cmp migration (#113)

* migrate Alert component

* convert Mainlist component

* add webpack watch task

* update build script for different manifests

* add types for api responses

* convert changeExtensionIcon

* convert inArray, getDomainParts, contains to ts

* convert changeExtensionTooltip

* convert changeExtensionState to ts

.eslintrc.js

@@ -13,6 +13,8 @@ module.exports = {
     'kentcdodds/import',
     'kentcdodds/jest',
     'kentcdodds/possible-errors',
+    'plugin:jest-dom/recommended',
+    'plugin:testing-library/recommended',
     'plugin:@typescript-eslint/recommended',
     'plugin:import/errors',
     'plugin:import/typescript',