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/direct_timeline/index.js

@@ -7,7 +7,6 @@ import ColumnHeader from '../../components/column_header';
 import { expandDirectTimeline } from '../../actions/timelines';
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
-import ColumnSettingsContainer from './containers/column_settings_container';
 import { connectDirectStream } from '../../actions/streaming';
 
 const messages = defineMessages({
@@ -86,9 +85,7 @@ export default class DirectTimeline extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
-        >
-          <ColumnSettingsContainer />
-        </ColumnHeader>
+        />
 
         <StatusListContainer
           trackScroll={!pinned}