And to python interface

It works!

* Add methods for calculation of pure fluid critical points

* Pass the template arguments along

* Expose the values and Jacobian

* Add Chebyshev2D departure term type

* Add partial molar volume as a possible output

* And expose to python

* Split out reducing and mutants to their own headers

* Remove unused function

Add test and expose in Python

Added a mockup of how one would hardcode models into the shared library (a la CoolProp), dynamic loads just need to be replaced with hardcoded strings, probably encoded as binary