Piccolo

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Added support for FastAPI to ``piccolo asgi new``.

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Fixed bug in ``BaseMigrationManager.get_migration_modules`` - wasn't
excluding non-Python files well enough.

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* Stopped ``piccolo migrations new`` from creating a config.py file - was
legacy.
* Added a README file to the `piccolo_migrations` folder in the ASGI template.

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Fixed `__pycache__` bug when using ``piccolo asgi new``.

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* Showing a warning if trying auto migrations with SQLite.
* Added a command for creating a new ASGI app - ``piccolo asgi new``.
* Added a meta app for printing out the Piccolo version -
``piccolo meta version``.
* Added example queries to the playground.

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* Added ``table_finder``, for use in ``AppConfig``.
* Added support for concatenating strings using an update query.
* Added more tables to the playground, with more column types.
* Improved consistency between SQLite and Postgres with ``UUID`` columns,
``Integer`` columns, and ``exists`` queries.

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