Enhance the way licenses are presented and fix inconsistencies

We need to provide a better view of the existing license information presented in the docs/licenses.xml file, in the form of a docs/licenses.html file that lists:

Group/Artifact/Version/License (name+original URL)/Local Copy(relative pathname link to local copy of the license in the licenses dir).

This can be achieved with an .xslt transformation that runs as part of the build process, which produces the desired licenses.html, and it would allow us to zip and forward the entire doc/licenses directory to a client that wants to evaluate the licenses used in Wildfly.

In addition we need to sanitize a bit the presented licensing information:

Licenses.html MUST contain a reference to the Wildfly version it applies to. It MUST also contain a timestamp (or build number) to uniquely identify it should it need changes within one Wildfly release cycle.