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/containers/status_list_container.js

@@ -11,15 +11,6 @@ const makeGetStatusIds = () => createSelector([
   (state, { type }) => state.getIn(['timelines', type, 'items'], ImmutableList()),
   (state)           => state.get('statuses'),
 ], (columnSettings, statusIds, statuses) => {
-  const rawRegex = columnSettings.getIn(['regex', 'body'], '').trim();
-  let regex      = null;
-
-  try {
-    regex = rawRegex && new RegExp(rawRegex, 'i');
-  } catch (e) {
-    // Bad regex, don't affect filters
-  }
-
   return statusIds.filter(id => {
     if (id === null) return true;
 
@@ -34,11 +25,6 @@ const makeGetStatusIds = () => createSelector([
       showStatus = showStatus && (statusForId.get('in_reply_to_id') === null || statusForId.get('in_reply_to_account_id') === me);
     }
 
-    if (showStatus && regex && statusForId.get('account') !== me) {
-      const searchIndex = statusForId.get('reblog') ? statuses.getIn([statusForId.get('reblog'), 'search_index']) : statusForId.get('search_index');
-      showStatus = !regex.test(searchIndex);
-    }
-
     return showStatus;
   });
 });