Scala version of creator, validator and util.
Expand Scala version; remove some Java sources.
Fix warning, remove unuse import.
Remove Java source.
Yet more scalaification...
Rename.
Another rename.
Add comment regarding simplification of parameter handling.
Improve file checks + shorten expressions by using imports.
Rename parameters.
Check the input text does not contain the signed text marker.

Otherwise, it would confuse the validator.
Update usage help.
Fix use of delimMarker before it's defined (hello, null) :-/