T.Imanishi

Add osflavor plugin

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Add [osflavor](https://github.com/eholic/osflavor) plugin automatically adding OS-flavored symbols to prompt.

feat: Add cleanup_work_dir option (#697, #686)

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This PR is adding `cleanup_work_dir` option to delete a working directory like `$HOME/actions_github_pages_*`. ### Issue `actions-gh-pages` creates a working directoriy every runs, it messes up $HOME directory and annoys users...

@FrodeSolheim `pip install lhafile` occurs the following error in Win10, because lhafile doesn't provide enough wheels for recent python 3.X . > error: Microsoft Visual C++ 14.0 is required. Get...