Add version functions
Add version functions

This was copied from the openslides project.

petervanderdoes/wger,kjagoo/wger_stark,rolandgeider/wger,kjagoo/wger_stark,kjagoo/wger_stark,rolandgeider/wger,DeveloperMal/wger,wger-project/wger,petervanderdoes/wger,DeveloperMal/wger,rolandgeider/wger,rolandgeider/wger,kjagoo/wger_stark,wger-project/wger,DeveloperMal/wger,wger-project/wger,DeveloperMal/wger,petervanderdoes/wger,wger-project/wger,petervanderdoes/wger