Build embedded Parity JS properly and separatly (#4426)

* Add a specific embed webpack build // output assets in JSON

* WIP Embed

* Updated Webpack

* Update exports // Webpack config

* Fix app build fail

* Fix NPm scripts

* Reduce Embed dependencies

* Fix NPM exports

* remvoe stats

* Lazy-Load worker (not to load in embed)

* PR Grumbles + Fix tests

js/src/views/Contract/contract.js

@@ -30,7 +30,8 @@ import { newError } from '~/redux/actions';
 import { setVisibleAccounts } from '~/redux/providers/personalActions';
 
 import { EditMeta, ExecuteContract } from '~/modals';
-import { Actionbar, Button, Page, Modal, Editor } from '~/ui';
+import { Actionbar, Button, Page, Modal } from '~/ui';
+import Editor from '~/ui/Editor';
 
 import Header from '../Account/Header';
 import Delete from '../Address/Delete';