* website, website_mass_mailing
Now, when any option method is called (editor left panel), the widgets
related to the targeted DOM is automatically updated. This is possible
to disable for a specific widget with `data-no-widget-refresh="true"`.
This commit also makes the `_refreshPublicWidget` method better handle
its async component: it is now "fully async" so the caller should wait
for its resolution before executing some other related code.