Xmlstarlet

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* Added Python 3.10 support.
* Fixed issue 199 (pending confirmation) - upgraded libxml2 and libxslt versions to fix CVEs
* Upgraded development and build-time dependencies.
* Now using latest `cibuildwheel` 2.5.0, which supports more architectures and builds.
* Started to improve the documentation - added better usage examples.
* Formatting and linting fixes

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* Fixed MacOS binary wheel builds

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* Simplified and automated building source and binary wheels for Linux, MacOS, and Windows via GitHub actions + `cibuildwheel`.
* Improved documentation and local development workflow.
* Fixes issue 51 (previously closed as "hard to fix", but now reopened).
* Completely rewritten native Windows build process, based on libxslt.
* Windows port does not support `ls` (and conversely `listdir()`).

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* No changes from previous release except up-to-date dependencies and some build fixes.
* Fixes issue 118 (awaiting confirmation).

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* First working release on PyPI, based on xmlstarlet-1.6.1 source tarball.

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* Second (failed) release on PyPI, based on XMLStarlet master branch.