fixes https://github.com/TryGhost/Team/issues/2924
This change adds a new bulk edit action for posts to update their
visibility. It also implements a modal to change the post access level
for multiple posts at once using this new API.
It also fixes a pattern that was used when modifying the Ember models in
memory. They previously were marked as dirty, this is fixed now. So when
going to the editor after modifying posts, you won't get a confirmation
dialog any longer.
fixes https://github.com/TryGhost/Team/issues/2919
This pull request implements a new feature that allows bulk editing of
posts by a filter. It adds a new `bulkEdit` endpoint to the posts API
and new `PostsService` methods to handle the bulk actions.
The posts list component is duplicated, so we can keep working in a
copied version without affecting the old version without a flag. It
temporarily adds a star icon to indicate featured posts in the posts
list.
