The unscheduled property is no longer set on a task object. To make a task unscheduled, omit or clear its start field instead. The store derives unscheduled: true from the missing date. See Unscheduled tasks for the updated usage
The Schedule / Unschedule toggle is no longer added to the Editor, and the unscheduledTasks option of getEditorItems is removed
The mode property of ResourceLoad no longer accepts the "grid" value. Use "utilization" (the default, the former "grid" behavior) or the new "histogram"