* started with forwarding support in downloader
* Add missing files.
* Add missing files.
* Raise needed Go version
* More Go version bumping.
* Fix forwarding
* Go 1.21+ needed
* Make terminating forwarder more robust.
* Better var naming
* Remove dead code. Improve commentary.
* Prepare validation status adjustment.
* Move validations to functions to make them executable in a loop.
* Introduce validation mode flag (strict, unsafe)
* Make uploader use the TOML config file intrastructure, too.
* Improve method naming a bit.
* Improve method naming a bit.
* Add forgotten struct tags for TOML
* Add version to command line only parameters in uploader documentation
* Be explicit about supported options in config file.
* allow interactive flags in config file.
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Co-authored-by: JanHoefelmeyer <Jan Höfelmeyer jhoefelmeyer@intevation.de>