New: Cleanup UI tooling, Update to Webpack 4, Gulp 4 (#655)

* New: Webpack 4

* New: Gulp 4

* New: Transpile UI for old browsers

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

frontend/src/Store/Actions/interactiveImportActions.js

@@ -1,7 +1,7 @@
-import $ from 'jquery';
 import moment from 'moment';
 import { createAction } from 'redux-actions';
 import { batchActions } from 'redux-batched-actions';
+import createAjaxRequest from 'Utilities/createAjaxRequest';
 import updateSectionState from 'Utilities/State/updateSectionState';
 import { createThunk, handleThunks } from 'Store/thunks';
 import { sortDirections } from 'Helpers/Props';
@@ -107,10 +107,10 @@ export const actionHandlers = handleThunks({
 
     dispatch(set({ section, isFetching: true }));
 
-    const promise = $.ajax({
+    const promise = createAjaxRequest({
       url: '/manualimport',
       data: payload
-    });
+    }).request;
 
     promise.done((data) => {
       dispatch(batchActions([