Piccolo

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Updated to work with Piccolo v1 (which uses Pydantic v2).

The front end code has also been substantially upgraded to Vue v3.

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Namespaced all custom values we added to Pydantic's JSON schema for easier
maintenance.

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All of the changes from 0.120.0 merged into the v1 branch.

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Initial alpha release of Piccolo v1, with Pydantic v2 support.

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Modified the ``BaseUser.login`` logic so all code paths take the same time.
Thanks to Skelmis for this.

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Improved how ``ModelBuilder`` generates JSON data.

The number of password hash iterations used in ``BaseUser`` has been increased
to keep pace with the latest guidance from OWASP - thanks to Skelmis for this.

Fixed a bug with auto migrations when the table is in a schema.

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