Update qore-xml-module to version 1.3.

Release notes:

This release contains major new functionality and many bugfixes over
the previous version; major features include:

* SaxIterator class
* FileSaxIterator class
* massive improvements in SOAP compatibility support entailing significant
  changes in the following modules:
  - WSDL
  - SoapClient
  - SoapHandler
* QUnit-based testing infrastructure

(nros)