Replace all file paths in code with `PathBuf` instead of `&str` or `String`

[SteveL-MSFT]

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Summary

Current code passes file paths around as strings, but converting from PathBuf to a string results in lossy (unicode) conversions. Paths should be passed around internally as PathBuf

Steps to reproduce

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Expected behavior

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Actual behavior

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Error details

Environment data

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Version

3.2

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