V2.1.0
本次更新包含以下优化：
1.自动保存上次关闭前的设置。
2.增强大批量文件处理性能，支持更高效稳定的操作。
3.Beatmap键数匹配且密度不降低时跳过转换，节省资源并保持体验。
4.新增预设选项功能，方便快速调用常用配置。
This update includes the following optimizations:
1.Automatically save settings from last session
2.Enhanced bulk file processing performance for more efficient and stable operations.
3.Skip conversion when beatmap keys match target and density is not reduced, saving resources and preserving experience.
4.Added preset options for quick access to frequently used configurations.