Keyword/phrase filtering (#7905)

* Add keyword filtering

    GET|POST       /api/v1/filters
    GET|PUT|DELETE /api/v1/filters/:id

- Irreversible filters can drop toots from home or notifications
- Other filters can hide toots through the client app
- Filters use a phrase valid in particular contexts, expiration

* Make sure expired filters don't get applied client-side

* Add missing API methods

* Remove "regex filter" from column settings

* Add tests

* Add test for FeedManager

* Add CustomFilter test

* Add UI for managing filters

* Add streaming API event to allow syncing filters

* Fix tests

app/javascript/mastodon/features/ui/index.js

@@ -12,6 +12,7 @@ import { debounce } from 'lodash';
 import { uploadCompose, resetCompose } from '../../actions/compose';
 import { expandHomeTimeline } from '../../actions/timelines';
 import { expandNotifications } from '../../actions/notifications';
+import { fetchFilters } from '../../actions/filters';
 import { clearHeight } from '../../actions/height_cache';
 import { WrappedSwitch, WrappedRoute } from './util/react_router_helpers';
 import UploadArea from './components/upload_area';
@@ -297,6 +298,7 @@ export default class UI extends React.PureComponent {
 
     this.props.dispatch(expandHomeTimeline());
     this.props.dispatch(expandNotifications());
+    setTimeout(() => this.props.dispatch(fetchFilters()), 500);
   }
 
   componentDidMount () {