New notification cleaning mode (#89)

This PR adds a new notification cleaning mode, super perfectly tuned for accessibility, and removes the previous notification cleaning functionality as it's now redundant.

* w.i.p. notif clearing mode

* Better CSS for selected notification and shorter text if Stretch is off

* wip for rebase ~

* all working in notif clearing mode, except the actual removal

* bulk delete route for piggo

* cleaning + refactor. endpoint gives 422 for some reason

* formatting

* use the right route

* fix broken destroy_multiple

* load more notifs after succ cleaning

* satisfy eslint

* Removed CSS for the old notif delete button

* Tabindex=0 is mandatory

In order to make it possible to tab to this element you must have tab index = 0. Removing this violates WCAG and makes it impossible to use the interface without good eyesight and a mouse. So nobody with certain mobility impairments, vision impairments, or brain injuries would be able to use this feature if you don't have tabindex=0

* Corrected aria-label

Previous label implied a different behavior from what actually happens

* aria role localization & made the overlay behave like a checkbox

* checkboxes css and better contrast

* color tuning for the notif overlay

* fanceh checkboxes etc and nice backgrounds

* SHUT UP TRAVIS

app/javascript/glitch/components/column/notif_cleaning_widget/container.js

@@ -0,0 +1,56 @@
+/*
+
+`<NotificationPurgeButtonsContainer>`
+=========================
+
+This container connects `<NotificationPurgeButtons>`s to the Redux store.
+
+*/
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+Imports:
+--------
+
+*/
+
+//  Package imports  //
+import { connect } from 'react-redux';
+
+//  Our imports  //
+import NotificationPurgeButtons from './notification_purge_buttons';
+import {
+  deleteMarkedNotifications,
+  enterNotificationClearingMode,
+} from '../../../../mastodon/actions/notifications';
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+Dispatch mapping:
+-----------------
+
+The `mapDispatchToProps()` function maps dispatches to our store to the
+various props of our component. We only need to provide a dispatch for
+deleting notifications.
+
+*/
+
+const mapDispatchToProps = dispatch => ({
+  onEnterCleaningMode(yes) {
+    dispatch(enterNotificationClearingMode(yes));
+  },
+
+  onDeleteMarkedNotifications() {
+    dispatch(deleteMarkedNotifications());
+  },
+});
+
+const mapStateToProps = state => ({
+  active: state.getIn(['notifications', 'cleaningMode']),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(NotificationPurgeButtons);