Treepoem

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* Upgrade BWIPP from 2017-06-20 to 2017-07-10. This has a few bug fixes. You
can read its changelog in the vendored copy in the `treepoem repo
<https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.

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* Upgrade BWIPP from 2015-11-24 to 2017-06-20. This has a number of bug fixes,
and supports more barcode types. It has also changed the pixel-for-pixel
output of some formats, although they still encode the same information -
notably QR codes, which are tested in ``treepoem``\'s test suite. You can
read its changelog in the `vendored copy in the treepoem repo
<https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.

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* Add ``treepoem.barcode_types``, a set of all the names of supported barcode
types, and error if asked to generate a barcode of an unknown type.

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* Support Windows.

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* Add the missing ``BWIPP`` files.

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* Use ``$PATH`` to find ``gs`` binary.
* Rename ``PostscriptError`` to ``TreepoemError``.
* Add basic ``setup.py``.
* Setup Travis CI build.
* Setup Tox


See https://github.com/adamchainz/treepoem/blob/main/CHANGELOG.rst