Ported KSpaceDuel to SVG graphics. The default_theme.svgz file is usable, but not pretty. It doesn't have very many explosion frames, so there are just little blips when something blows up.

I changed the version number to 2.0 because this is such a significant change.

The sprites aren't installed with everything else, but I left them in SVN so that artists can use them as a reference.

There were a couple of minor tweaks to the code, as well.