new structure in class PostmanCommandLineOptions --> class CommandLineParser not necessary anymore
some changes in other classes (QbicDataStatus, QbicDataDownloader, App) due to the new structure
format usage help message
Open:
update README
Remove/work on currently not used options
some picocli functions don't work as expected (mutually exclusive options, parse over all arguments)
---> current solution for these without use of picocli
Changes:
Open: