Improve parsing

[egwepas]

Rely on jaxb instead of handwrited DOM parsing and xsd.

• java first (doc in annotations)
• no parsing (deserialization)
• xsd generated from java with maven plugin

That would make the tool more simple to extend, maintain, document, with a lot less code.

However that would imply to re-code the parameters subsitution and special care for protocols where messages are described in XML (can a jaxb object contain DOM item ?).