invoice prefix can now be controlled by invoice settings page
update pom version
fixed zugferd test for vat id
fixed invoice creation from timerecords based on DAY / WORKING_DAY task units; added tax id and vat id to company and person properties; changed zugferd invoice creation to used vat id and tax id from trade parties; changed invoice template to show vat id and contract id; other small bugfixes
changes
added oauth2 setup
removed legacy struts frontent module added maven backend build module
change from springfox to springdoc; updated hiberante, h2, hsql, mysql, postgres and more versions