Simple-palette-utils

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- added missing typing hint imports
- added ability to extend color lists and palettes with custom ones
- added `palette_list_to_triplets` method to convert flat list into list of R,G,B tuples
- added `palettes` method for returning the sorted list of available palettes

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- exposed `color_lists` method

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- added methods `parse_rgb` and `parse_rgba`
- added class `ColorProvider` to make color management easier

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- initial release


PyPi

Preparation:

* increment version in `setup.py`
* add new changelog section in `CHANGES.rst`
* commit/push all changes

Commands for releasing on pypi.org (requires twine >= 1.8.0):

commandline
find -name "*~" -delete
rm dist/*
python3 setup.py clean
python3 setup.py sdist
twine upload dist/*


Github

Steps:

* start new release (version: `vX.Y.Z`)
* enter release notes, i.e., significant changes since last release
* upload `simple_palette_utils-X.Y.Z.tar.gz` previously generated with `setup.py`
* publish