Rbinvariantslib

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* Workaround an issue in dependency PyGeopack that would cause segmentation faults when calling ``models.get_tsyganenko()`` with large grids (`External PyGeopack Issue 26 <https://github.com/mattkjames7/PyGeopack/issues/26>`_)

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* Renamed package to ``rbinvariantslib`` from ``dasilva-invariants``
* Published first pip package and overhauled unnecessary dependencies
* Made ``get_tsyagnenko_params() retrieve parameters from CDAWeb API
* Added unit test for examples and core functionality
* Added CHANGELOG