1.0.13

1. Optimize MasqueradeClass and fix known problems.
2. Refactor the tree function, now the code is more decoupled.
3. tree function parameter naming adjustment: downtop -> bottom_up, mysophobia -> pure_path.
4. tree function parameter level default value adjustment: maximum recursion depth -> maximum directory depth.
5. Supports checking whether a file contains subcontent, The method is located in Content.contains. #4
6. Adjust some parameter comments, all Generator is replaced with Iterator.

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1. 优化 MasqueradeClass，并修复已知的问题。
2. 重构 tree 函数，现在的代码更解耦。
3. tree 函数参数命名调整：downtop -> bottom_up, mysophobia -> pure_path。
4. tree 函数参数 level 默认值调整：最大递归深度 -> 最大目录深度。
5. 增加检查文件内容中是否包含子内容的方法，位于 Content.contains。#4
6. 调整部分参数注解，所有的 Generator 全部更换为 Iterator。