Update to last version of gvt library 1.6.3 + method correction + add...

Update to last version of gvt library 1.6.3 + method correction + add application.conf file for custom level error

Lien Sonar : https://gazelle.ihe.net/sonarqube/dashboard?id=net.ihe.gazelle%3AGazelleHL7v2Validator&branch=feature%2Fmaj_gvt_validator