Click with option groups

Cloup enriches Click with several features that make it more expressive and configurable:

 * option groups and an (optional) help section for positional arguments
 * constraints, like mutually_exclusive, that can be applied to option groups
   or to any group of parameters, even conditionally subcommand aliases
 * subcommands sections, i.e. the possibility to organize the subcommands of
   a Group in multiple help sections
 * a themeable HelpFormatter that:
   - has more parameters for adjusting widths and spacing, which can be
     provided at the context and command level use a different layout when the
     terminal width is below a certain threshold in order to improve
     readability
   - suggestions like "did you mean <subcommand>?" when you mistype a
     subcommand

Moreover, Cloup improves on IDE support providing decorators with detailed type hints and adding the static methods Context.settings() and HelpFormatter.settings() for creating dictionaries of settings.

This package provides the Python 3 module.

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