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

Couple of inlines are needed to avoid duplication of functions between compilation units