PLT-6214 Move channel store and actions over to redux (#6235)

* Move channel store and actions over to redux

* Fix style errors

* Fix unit test

* Various fixes

* More fixes

* Revert config changes

webapp/components/channel_view.jsx

@@ -8,7 +8,7 @@ import * as UserAgent from 'utils/user_agent.jsx';
 import ChannelHeader from 'components/channel_header.jsx';
 import FileUploadOverlay from 'components/file_upload_overlay.jsx';
 import CreatePost from 'components/create_post.jsx';
-import PostViewCache from 'components/post_view/post_view_cache.jsx';
+import PostViewCache from 'components/post_view';
 
 import ChannelStore from 'stores/channel_store.jsx';