Mustang 2.5.7

Mustang 2.5.7

Mustangproject version 2.5.7, released November 7th, 2022, works again in Java 1.8 and improves the validator (EN16931 checks are now also run on “Basic” profile) as well as the importer: ZF1 invoices can now be imported in the invoiceimporter and some getters were added to the ordinary importer.