Make Saxon log to component registry log

[twagoo]

https://trac.clarin.eu/ticket/853

Saxon sends log/error messages to stdout, which means they end up in catalina.out in production. This is not as tidy as it could be. This can be improved by configuring a custom error listener for the transformer, see metadata translator for an example:

• ​TranslatorImpl.java
  • transfFactory = createTransformerFactory();
  • transfFactory.setErrorListener(new TranslationServiceErrorListener(logger));
• ​TranslationServiceErrorListener.java