Allow joining several hashtags in a single column (#8904)

* Nascent tag menu on frontend

* Hook up frontend to search

* Tag intersection backend first pass

* Update yarnlock

* WIP

* Fix for tags not searching correctly

* Make radio buttons function

* Simplify radio buttons with modeOption

* Better naming

* Rearrange options

* Add all/any/none functionality on backend

* Small PR cleanup

* Move to service from scope

* Small cleanup, add proper service tests

* Don't use send with user input :D

* Set appropriate column header

* Handle auto updating timeline

* Fix up toggle function

* Use tag value correctly

* A bit more correct to use 'self' rather than 'all' in status scope

* Fix some style issues

* Fix more code style issues

* Style select dropdown more better

* Only use to_id'ed value to ensure no SQL injection

* Revamp frontend to allow for multiple selects

* Update backend / col header to account for more flexible tagging

* Update brakeman ignore

* Codeclimate suggestions

* Fix presenter tag_url

* Implement initial PR feedback

* Handle additional tag streaming

* CodeClimate tweak

app/javascript/mastodon/features/standalone/hashtag_timeline/index.js

@@ -27,7 +27,7 @@ class HashtagTimeline extends React.PureComponent {
     const { dispatch, hashtag } = this.props;
 
     dispatch(expandHashtagTimeline(hashtag));
-    this.disconnect = dispatch(connectHashtagStream(hashtag));
+    this.disconnect = dispatch(connectHashtagStream(hashtag, hashtag));
   }
 
   componentWillUnmount () {