Storyboard now takes its image and sound information from within the XML so that it can be used without the screen framework.
Downside: Storyboard music is no longer automatically handled by screen transitioning.
Note that the storyboard still uses the global "dt" timer variable.
To migrate existing storyboards, add all your sounds and images to a <resources> tag as in the example.  Music length should be moved to its corresponding resource.