Piccolo

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Using orjson for JSON serialisation when using the ``output(as_json=True)``
clause. It supports more Python types than ujson.

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Improved ``piccolo user create`` command - defaults the username to the current
system user.

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Fixing bug when sorting ``extra_definitions`` in auto migrations.

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* Fixed typos.
* Bumped requirements.

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* Added ``Date`` and ``Time`` columns.
* Improved support for column default values.
* Auto migrations can now serialise more Python types.
* Added ``Table.indexes`` method for listing table indexes.
* Auto migrations can handle adding / removing indexes.
* Improved ASGI template for FastAPI.

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Exposing the site name on the login page, courtesy of sinisaos.

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