J2y

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- Deprecate ``j2y`` command in favour of ``j2cli`` as it will be removed in the
next version.

- *[SECURITY]* Update ``jinja2`` and ``pyyaml`` dependencies.

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- *[FIX]* Fix the behaviour of the default input that broke with the
introduction of multiple input files. It is now possible again to redirect
stdin to the command without specifying the ``-c/--context`` argument, such
as ``j2y template.j2 < values.yaml``. Default stdin is ignored, however, if
additional input files are provided.

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- *[FEATURE]* Add serialization functions ``json`` and ``yaml`` as template
filters.

- *[FEATURE]* Add support for multiple input files using the ``-c`` or
``--context`` argument.

- *[FEATURE]* Add hashlib digest functions ``md5sum``, ``sha1sum``,
``sha256sum`` and ``sha512sum`` as template filters.

- *[FEATURE]* Provide environment variables as template variable ``env``.

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- *[FEATURE]* Add Base64 template filters (``b64encode``, ``b64decode``).

- *[FEATURE]* Add support for the `HCL <https://github.com/hashicorp/hcl>`_
file format as input file.

- *[FEATURE]* Initial feature set with YAML and JSON file format as input file.