Async-pokepy

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- :class:`Machine` object with :meth:`Client.get_machine`
- Added `lru-dict <https://pypi.org/project/lru-dict/>`_ as an optional package for overall
better caching with a least recently used algorithim and a maxsize of 128.
- :class:`UnNamedBaseObject` for full objects without a name provided.
- Can now pass a custom :class:`aiohttp.ClientSession`
in :meth:`Client.connect`.

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- Hotfixes for :class:`AsyncPaginationIterator` mostly.

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- Various improvements with :class:`AsyncPaginationIterator`
and :class:`AsyncIterator`
- Many objects attributes that were strings are now :class:`NamedAPIObject`
or :class:`APIObject`.
- :class:`AsyncPaginationIterator` now uses both of the
instead of a :class:`tuple`.
- :class:`MachineVersionDetail` for :class:`Move`
- :class:`Berry` objects.

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- Added :class:`Ability` and :meth:`Client.get_ability` for ability objects.

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- Sprites from :meth:`Client.read_sprite` and :meth:`Client.save_sprite`
are now cached.
- Slight improvements in internal caching.

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- :class:`Move` objects and :meth:`Client.get_move`
(still incomplete and need testing).
- Integrated :class:`AsyncIterator` and :meth:`Client.get_pagination`
for API pagination, still incomplete and needs testing too.
- :data:`version_info` for a :data:`sys.version_info`-like
:func:`~collections.namedtuple`.
- All modules now have ``__all__`` defined to them.