constSolidThermo: New solidThermo supporting uniform and non-uniform constant property specification

Description
    Uniform or non-uniform constant solid thermodynamic properties

    Each physical property can specified as either \c uniform in which case the
    value entry is read or \c file in which case the field file in read
    from the constant directory.

Usage
    Example of uniform constant solid properties specification:
    \verbatim
        thermoType          constSolidThermo;

        rho
        {
            type        uniform;
            value       8940;
        }

        Cv
        {
            type        uniform;
            value       385;
        }

        kappa
        {
            type        uniform;
            value       380;
        }
    \endverbatim

    Example of non-uniform constant solid properties specification:
    \verbatim
        thermoType          constSolidThermo;

        rho
        {
            type        file;
        }

        Cv
        {
            type        file;
        }

        kappa
        {
            type        file;
        }
    \endverbatim
    where each of the field files are read from the constant directory.

tutorials/modules/CHT/coolingCylinder2D/constant/solid/physicalProperties

@@ -13,40 +13,25 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-thermoType
+thermoType          constSolidThermo;
+
+rho
 {
-    type            heSolidThermo;
-    mixture         pureMixture;
-    transport       constIsoSolid;
-    thermo          eConst;
-    equationOfState rhoConst;
-    specie          specie;
-    energy          sensibleInternalEnergy;
+    type        uniform;
+    value       8940;
 }
 
-mixture
+Cv
 {
-    specie
-    {
-        nMoles      1;
-        molWeight   63.5;   // [g/mol]
-    }
-
-    transport
-    {
-        kappa   380;        // [W/m/K]
-    }
-
-    thermodynamics
-    {
-        Hf      0;
-        Cv      385;        // [J/kg/K]
-    }
-
-    equationOfState
-    {
-        rho     8940;       // [kg/m^3]
-    }
+    type        uniform;
+    value       385;
 }
 
+kappa
+{
+    type        uniform;
+    value       380;
+}
+
+
 // ************************************************************************* //