Sqlf

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* Add support for aggregate UDFs
* Extend cbor support
* Refactor UDF library
* Rename sql -> sqlf
* Rewrite and extend tests
* Add UDF b91enc, b91dec
* Drop support for Python 3.5
* Add as_type

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* Add single_row decorator
* Fix naming of match UDF to similar
* Add UDF sha3
* Add UDF nounce
* Add UDF hex
* Satisfy linter

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* Update docs
* Remove old sqlfunc code
* Add UDF cbor, uncbor
* Add helper to list history

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* Add UDF number
* Disable support for Python 3.4 (Travis CI)
* Add dependency typeguard
* Add UDF match

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* Automatic deployment to PyPI.

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* Various fixes to the repo.