Some undeclared prerequsites
Better implementation of super_can()

Prompted by https://rt.cpan.org/Ticket/Display.html?id=83218

UR::ModuleBase::super_class and super_can() relied on undocumented behavior
that existed up to perl 5.16 that's likely to go away in later versions.
Perl kept a cache of inherited methods in a $class::SUPER namespace.  The
mechanism behind the cache is changing and the ::SUPER package is going away.

We'll just iterate over the parent classes and call can() on each of them.