ENH: Adding interCondensingEvaporatingFoam and tutorial

Merged Sergio Ferraris requested to merge feature-interCondensatingEvaporatingFoam into develop
Solver for 2 incompressible, isothermal immiscible fluids using a VOF
(volume of fluid) phase-fraction based interface capturing approach.
The momentum and other fluid properties are of the "mixture" and a single
momentum equation is solved.

Solver: /applications/solvers/multiphase/interCondensingEvaporatingFoam Tutorial: /tutorials/multiphase/interCondensingEvaporatingFoam/condensatingVessel

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