* Synchronize smart cell source before evaluation
* Sync JS view only if present
* Synchronize with smart cell only when started
* Update references to kino packages
* Update the Smart cells notebook
* Rename add dependnecy to add package
* Update changelog
* Serve iframes from another local port when running on http
* Use relative hostname in local iframe URL
* Simplify server start check
* Use random iframe port when Livebook runs on a random port
* Rename space/ to iframe/
* LivebookWeb.IframePlug -> LivebookWeb.IframeEndpoint