application-docker.properties

- Add colorful output depending on log severity 🎉
- Improved Dockerfile to use Docker caching better (=as long as pom.xml does not change, doesn't download deps again)
- Surpress bulky Spring INFO output
- Fix useless "No URLs will be polled" warning through suggested empty config.properties (https://github.com/Netflix/Hystrix/issues/275)
- Finally replaced Spring Web MVC with Webflux
- CORS Config replacing old Web MVC Config (fixes warning in f622eb3d)