message: Update ItemDirectory to 0.7.9
diff: -declare class ItemDirectory {}
  +/**
  + * A directory of Item entities in the Sidebar
  + */
  +declare class ItemDirectory extends SidebarDirectory {
  + /**
  + * @override
  + */
  + static get entity(): string;
  +
  + /**
  + * @override
  + */
  + static get collection(): Items;
  +
  + /**
  + * @param selector - (unused)
  + * @override
  + */
  + protected _canDragStart(selector: string | null): boolean;
  +
  + /**
  + * @param selector - (unused)
  + * @override
  + */
  + protected _canDragDrop(selector: string | null): boolean;
  +
  + /**
  + * @override
  + */
  + protected _getEntryContextOptions(): ContextMenu.Item[];
  +}
  