基础功能

Signed-off-by: hancong03 <121371790@qq.com>
版本进度暂存

Signed-off-by: hancong03 <121371790@qq.com>
左右移动保存进度

Signed-off-by: hancong03 <121371790@qq.com>
修复占位符在遍历时的跳出bug

Signed-off-by: hancong03 <121371790@qq.com>