Library can be omitted

For use in "empty world" where objects are directly placed into the
world, don't need a library.  This option in the template can eliminate
a non-functional library.
Updated Cargraph step

Now the cargraph step can be applied to graphs with large y-values
(previously one tick per unit, now 1 tick per X units).
box2d save only when box2dModel defined

this is an error that occurs everywhere