Add Oxygen XQuery XProc transformation scenario

[AirQuick]

This pull request adds XSpec for XQuery using XProc transformation scenario to the Oxygen framework.

Aside from their names, the only difference between the existing XSpec for XSLT using XProc and this new additional XSpec for XQuery using XProc is this field:

<field name="inputXSLURL">
	<String>${framework}/src/harnesses/saxon/saxon-xquery-harness.xproc</String>
</field>

That should be enough according to our Wiki.

On Oxygen 21.1 on Windows and Linux, I verified that the new XSpec for XQuery using XProc transformation scenario worked with tutorial/xquery-tutorial.xspec and test/xspec-variable.xspec.

[AirQuick]

Sorry for rushing, but I'm merging this because

• Two more pull requests will depend on this.
• This is a new additional transformation scenario. No existing user depends on this.
• It's very easy to revert this change.
• I'll be busy next month.
• I verified again that inputXSLURL was the only difference compared to the XSLT transformation scenario.