Sungai

- Add ignore file support with --ignore_config argument
- Remove scipy dependency altogether

- get_structure method bug fixes

- Pre-order traversal version to control order of directory traversal
- Pre-order traversal open up possibility to omit ignored files and dirs in future using ._ignore files
- OS agnostic path management
- Add basic coverage and tox configuration
- Run unit tests in Github workflow
- Support for Python versions 3.8 to 3.11 included
- Upgrade setup.py