Adventurelib

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* Fix: prevent repeating an identifier in a `when` pattern.
* Minor packaging improvements.

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* New: Commands can be configured to be active only in certain :ref:`contexts`.
* Fix: ``say()`` function does not dedent before wrapping text.

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* New: ``say()`` function that eliminates formatting problems in printing
multi-line prose.
* New: :meth:`get_random()` and :meth:`take_random()` functions to allow
randomly selecting items from a :class:`Bag`.
* Fix: a bug where ``when`` statements match even if extra words are given.
* Fix: Bag find/get methods were not properly case-insensitive.

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Initial public release.