Audobject

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* Added: argument ``flatten`` to ``audobject.Object.to_dict()``

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* Added: ``audobject.Object.arguments()``,
``audobject.Object.hidden_arguments()``,
``audobject.Object.resolvers()``
* Added: ``hide`` to ``audobject.init_decorator()`` (replaces ``ignore_vars``)
* Changed: Serialize only arguments of ``__init__`` to YAML
* Changed: Raise error if user tries to hide argument without default value
* Changed: Raise error if argument that is not hidden is not assigned to a variable
* Removed: ``check_vars`` from ``audobject.init_decorator``

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* Fixed: dependency to ``audeer``

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* Fixed: support empty dictionary

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* Changed: replace ``override_vars`` with ``kwargs``

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* Added: option to ignore variables
* Added: option to override variables
* Changed: change ``sanity_check=True`` to ``check_vars=False``