Feature/add toa ref transformer

Merged Daniel Scheffler requested to merge feature/add_TOARef_transformer into master

This branch adds the TOA reflectance processor (processors.radiometric_transform.Radiometric_Transformer).

Additionally, the development of the TOARef processor required to add the following new features:

  • earth-sun-distance lookup table + reader
  • spectral response functions for EnMAP (model.srf.SRF)
  • solar irradiance lookup table + reader
  • computation of solar irradiance per band
  • config module (options.config)
  • default config JSON file
  • default config schema (validator)
  • command line argument parser (enpt_cli.py)
  • EnPT controller
  • many tests

The CI system had to be fixed.

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