ENH: Surface film - added thermo film sub-model framework

src/regionModels/surfaceFilmModels/Make/files

...c/filmThermoModel/constantFilmThermo/constantFilmThermo.C

...c/filmThermoModel/constantFilmThermo/constantFilmThermo.H

...nematic/filmThermoModel/filmThermoModel/filmThermoModel.C

...nematic/filmThermoModel/filmThermoModel/filmThermoModel.H

...atic/filmThermoModel/filmThermoModel/filmThermoModelNew.C

...matic/filmThermoModel/liquidFilmThermo/liquidFilmThermo.C

...matic/filmThermoModel/liquidFilmThermo/liquidFilmThermo.H