Add polls (#10111)

* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media

app/javascript/mastodon/containers/poll_container.js

@@ -0,0 +1,8 @@
+import { connect } from 'react-redux';
+import Poll from 'mastodon/components/poll';
+
+const mapStateToProps = (state, { pollId }) => ({
+  poll: state.getIn(['polls', pollId]),
+});
+
+export default connect(mapStateToProps)(Poll);