Reimplement cursor as a query operation

cmd/view-menu/main.go

@@ -35,7 +35,7 @@ func main() {
 		log.Fatalf("Couldn't load menu %s: %v", *menuName, err)
 	}
 
-	driver, err := ui.NewDriver(menu)
+	driver, err := ui.NewDriver(assets, menu)
 	if err != nil {
 		log.Fatalf("Couldn't initialize interface: %v", err)
 	}
@@ -45,13 +45,6 @@ func main() {
 		log.Fatal("Couldn't create window: %v", err)
 	}
 
-	// TODO: move this into driver. It will need to be able to change cursor.
-	cursor, err := assets.Cursor(assetstore.UltPointer)
-	if err != nil {
-		log.Fatalf("Couldn't load cursor: %v", err)
-	}
-	win.SetCursor(cursor.Image)
-
 	if err := win.Run(); err != nil {
 		log.Fatal(err)
 	}