Sshoot

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- Use ``pyxdg`` instead of ``xdg``.

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- Specify long description content-type.

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- Support profiles listing in different formats (table, CSV, YAML,
JSON) (Fixes: 3).
- Move configuration path to XDG conventions (Fixes: 1).

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- Move project to GitHub, small test cleanups.

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- Filter running sessions for start/stop commands autocompletion.

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- Fix autocompletion setup again.