This finally makes the licensing under AGPL-3.0-or-later explicit after
I got the okay from the kickstart source owners.
This also checks the REUSE compliance in a pre commit hook, and
therefore also in CI.
This also does a major restructuring of the inventory mutate form.
Some things still are not as they should be, but it mostly works like
before. They can be fixed later.
Co-authored-by: Theo Reichert <theo.reichert@mailbox.tu-dresden.de>