Creating dummy <change> elements was a workaround for the
HTML DTD not allowing empty <ul> elements, but we can do
better by tweaking the the XSLT stylesheet.

Now that the source file is validated against a schema that
only allows the <code> HTML tag to be used, we can rely on
that assumption to simplify our XSLT stylesheet.

Currently, building the NEWS file involves using a XSLT stylesheet
to extract information from the same HTML file that's used on the
libvirt website.

The process works, but it's quite fiddly in that it requires the
source HTML to be formatted in a very precise way, and a single
missing newline can mess up the resulting plain text considerably.

Moreover, the XSLT stylesheet itself encodes a lot of the details
of converting to plain text in a way that's not necessarily easy
to understand, tweak or fix.

To improve the process, move all existing entries to a new XML
file that contains exactly the information we care about in a
simple structured format, and start generating both the HTML and
plain text versions of the release notes using XSLT stylesheets
that can now afford to be almost trivial.