PLT-2713/PLT-6028 Added System Users list to System Console (#5882)

* PLT-2713 Added ability for admins to list users not in any team

* Updated style of unit test

* Split SearchableUserList to give better control over its properties

* Added users without any teams to the user store

* Added ManageUsers page

* Renamed ManageUsers to SystemUsers

* Added ability to search by user id in SystemUsers page

* Added SystemUsersDropdown

* Removed unnecessary injectIntl

* Created TeamUtils

* Reduced scope of system console heading CSS

* Added team filter to TeamAnalytics page

* Updated admin console sidebar

* Removed unnecessary TODO

* Removed unused reference to deleted modal

* Fixed system console sidebar not scrolling on first load

* Fixed TeamAnalytics page not rendering on first load

* Fixed chart.js throwing an error when switching between teams

* Changed TeamAnalytics header to show the team's display name

* Fixed appearance of TeamAnalytics and SystemUsers on small screen widths

* Fixed placement of 'No users found' message

* Fixed teams not appearing in SystemUsers on first load

* Updated user count text for SystemUsers

* Changed search by id fallback to trigger less often

* Fixed SystemUsers list items not updating when searching

* Fixed localization strings for SystemUsers page

webapp/components/sidebar.jsx

@@ -18,6 +18,7 @@ import PreferenceStore from 'stores/preference_store.jsx';
 import ModalStore from 'stores/modal_store.jsx';
 
 import * as AsyncClient from 'utils/async_client.jsx';
+import {sortTeamsByDisplayName} from 'utils/team_utils.jsx';
 import * as Utils from 'utils/utils.jsx';
 import * as ChannelUtils from 'utils/channel_utils.jsx';
 import * as ChannelActions from 'actions/channel_actions.jsx';
@@ -637,7 +638,7 @@ export default class Sidebar extends React.Component {
 
         // create elements for all 4 types of channels
         const favoriteItems = this.state.favoriteChannels.
-            sort(Utils.sortTeamsByDisplayName).
+            sort(sortTeamsByDisplayName).
             map((channel, index, arr) => {
                 if (channel.type === Constants.DM_CHANNEL) {
                     return this.createChannelElement(channel, index, arr, this.handleLeaveDirectChannel);