Beta 0.5.7

让我们说中文：
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更新:
1.使用“TeiGUIlib”来显示GUI
2.现在可以下载文件夹了
3.使用SHA-1验证文件完整性

修复：
1.修复闪屏
2.修复没有配置文件但是修改配置文件导致客户端报错问题
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For English：
Update:

1. Use "TeiGUIlib" to display the GUI
2. Now it's time to download the folder
3. Use SHA-1 to verify file integrity

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Fix:

1. Fix splash screen
2. Fixed the issue that there is no configuration file but the configuration file is modified, causing the client to report an error