* PLT-2321 Move the toggle icon next to the link being previewed
only applicable to one-line messages started with link
* remove useless "Youtube" header when no title is available
* allow breaking long links instead of toggle
* simplify "/" to "/<wbr />" replacing
fix empty post without additional content body
* discard buggy "simplification"
* Refactored posts view to use view controller design
* Add post view caching
* Required updates after rebase
* Fixed bug where current channel not set yet was causing breakage
