Shillelagh

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- Fix for column names with double quotes

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- Remove support for Python 3.7
- Remove upper bounds from dependencies

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- Allow adapters/dialects to pass custom parameters to ``apsw.Connection``

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- Read SQLite constants from ``apsw``
- Fix description returned in the case of empty set
- Change cost to be a float
- Fix GSheets ``do_ping``
- Small fixes and typos.

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- Relax ``requests`` dependency
- Enable ``supports_statement_cache``

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- Fix for GSheets where the first row is not detected as column names