Gfw-creator

Fix

- fixes version numbers, adds commitizen config to automatically increment versions

Fix

- **setup**: adds real cdo dependency
- bumpversion fixup
- fixup version numbers
- fixes unit conversion (it was the wrong way around)
- **gfw_creator**: applies unit conversions to file, assumes user gives Sv

Feat

- plugin works
- works except for unit conversion

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* First release on PyPI.