The first post-PyDAWv4-release bug...  It turns out that automation was
jacked-up under certain circumstances...
Add a new slider .png + rework the CSS theme, or in other words, completely
change the appearance on the first minor release after a major release.

hashtag:  #WhyDidntIthinkOfThisBeforeReleasingPyDAWv4
Make the label for "show version info" copy-able, so that people can
copy the Git revision out for pasting into a terminal...