Add VDmnFunctions

...i/src/main/java/de/unikoblenz/fgbks/api/test/TestApi.java

...z/fgbks/core/dmn/domain/vdmn/parser/SimpleVDmnParser.java

...blenz/fgbks/core/dmn/domain/vdmn/utils/VDmnFunctions.java

...n/java/de/unikoblenz/fgbks/core/dmn/utils/DmnService.java

...lenz/fgbks/core/dmn/verification/VerificationService.java

...gbks/core/dmn/verification/verifier/AbstractVerifier.java

...bks/core/dmn/verification/verifier/impl/DateVerifier.java

...e/dmn/verification/verifier/impl/EmptyOutputVerifier.java

...ore/dmn/verification/verifier/impl/IdenticalVerifier.java