* Make items redraws return queues * Parallel initial items redraw * Seperate read and write actions in items * Parallel all items redraws * Remove comments * Fix linting comments * Fix redraws on actions * Seperate group read and write * Add objects that can be dropped to items * Move example * Fix group get/set group properties * Add documentation * Remove console.log * return Group.js changes * Fix review comments * Fix example * Update drag&drop.html