Yamlify

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- Fix bugs in io functions
- Improve the performance of some functions
- Optimize the code of some functions
- Add function to convert yaml, json, and xml data to csv
- Add function to convert csv data into yaml, xml, and json

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- Add io functions (read_file, scan_url, and save_file)

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- Simplify all existed function
- Remove un-needed existed function
- Add xml_to_json
- Add xml_to_yaml
- Add yaml_to_xml
- Add json_to_xml

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- Refactor code structure
- Add json_to_yaml function

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- First Stable Release