publication workflow in the area of the save buttons?

[wouterj]

Migrated from sonata-project/SonataDoctrinePhpcrAdminBundle#315. Original description:

As the publish decision is about saving the content and not just one of many sections of the content, the controls would ideally be shown next to the save buttons. we could even replace "Save" with a "Publish" and "Save Draft" resp. "Unpublish" button. (without versioning, saving draft of a published content is not possible, only unpublish)