Meta Boxes Above Editor

Screenshots

Designed initially to work with CMB2, but will work with any Meta Box. Adds a new ‘Postbox Container’ to WordPress above the editor (postbox-container-0) to render meta boxes above the editor (below the title). You can use this container to drag existing meta boxes above the editor. To initialize a meta box above the editor, you can add a ‘context’ value of ‘primary’ when you register the meta box, and it will automatically appear above the editor.