Add additional levels of template instantiations
While we can template "top" level objects, like classes and functions, we have come across the need to template a constructor within a templated class.
CastXML doesn't find templated constructors with a class without instantiating the template beforehand: https://github.com/RobotLocomotion/drake/blob/master/common/polynomial.h#L148
Add a new object to to config file regarding needed/additional instantiations