Isofit

Updates include:

- Support for AVIRIS-3
- New parameterization of surface reflectance in multi-transmittance MODTRAN template file
- Bug fixes

Updates include:

- New click-based command-line interface
- Updated dockerfiles and additional cpu architecture support for docker
- EWT calculation from reflectance
- Bug fixes

- re-adds build of source distribution to release workflow

- fixes typo in README file name in setup.cfg in order to reestablish package description on PyPi

- adds utility scripts as terminal commands
- deprecates argparse in favour of [click](https://click.palletsprojects.com/en/8.1.x/)
- moves package build from `setup.py` to `setup.cfg`
- fixes failure of automatic conda-forge upload

Minor updates for improved workflow and readme.