Piccolo-api

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Added dependency injection to ``PiccoloCrud`` hooks - the Starlette request
object will now be passed in if requested. For example::

def my_hook(row_id, request):
...

Thanks to AnthonyArmour and destos for this.

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Added support for file storage in a local folder and in S3. This was added for
Piccolo Admin, but is useful for all Piccolo apps. Thanks to sinisaos for
assisting with this.

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Make Piccolo API work with Piccolo >= 0.82.0. ``Table`` used to accept a
parameter called ``ignore_missing``. This was renamed to ``_ignore_missing``.
Thanks to sinisaos for this fix.

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Improved the HTTP status codes returned by the ``change_password``,
``register`` and ``session_login`` endpoints. They now return a 422 status
code if a validation error occurs. This is required by Piccolo Admin, to better
determine why a request failed.

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Added ``read_only`` option to ``change_password`` and ``register`` endpoints.

This is for Piccolo Admin's ``read_only`` mode.

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Changed a parameter name used in the ``change_password`` endpoint to be less
ambiguous (``old_password`` -> ``current_password``).

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