thermophysicalProperties: New base-class for liquidProperties and in the future gasProperties

Description
    Base-class for thermophysical properties of solids, liquids and gases
    providing an interface compatible with the templated thermodynamics
    packages.

liquidProperties, solidProperties and thermophysicalFunction libraries have been
combined with the new thermophysicalProperties class into a single
thermophysicalProperties library to simplify compilation and linkage of models,
libraries and applications dependent on these classes.