ENH: solidIsothermalReactionRate: new solid reaction rate model

reactions
{
    _tmp_
    {
        #include "<constant>/panelRegion/thermo.solid"
    }
    charReaction
    {
        type        irreversibleIsothermalSolidReaction;
        reaction    "PMMA = gas";
        C           <scalar>;
        Tpc         <scalar>;
        Elat        <scalar>;
        Cp          ${../_tmp_/PMMA/thermodynamics/Cp};
    }
    #remove _tmp_
}