Fix events for themes and extmodules

client/src/modules/extmodule.js

@@ -8,6 +8,8 @@
  * LICENSE file in the root directory of this source tree.
 */
 
+import { EventEmitter } from 'events';
+
 class ExtModuleEvents {
     constructor(extmodule) {
         this.extmodule = extmodule;

client/src/modules/theme.js

@@ -9,6 +9,8 @@
 */
 
 import ThemeManager from './thememanager';
+import { EventEmitter } from 'events';
+import { SettingUpdatedEvent, SettingsUpdatedEvent } from 'structs';
 import { DOM, Modals } from 'ui';
 import { FileUtils, ClientIPC } from 'common';