Create IR Layer for BSDF

[vidanovic]

Create IR Layer for BSDF in a same way as it is done for CScatteringLayer:

class CScatteringLayerIR
    {
    public:
        explicit CScatteringLayerIR(CScatteringLayer layer);

        // This function is valid only for specular layers
        double emissivity(FenestrationCommon::Side t_Side,
                          EmissivityPolynomials type = EmissivityPolynomials::NFRC_301_Uncoated);

        double emissivity(FenestrationCommon::Side t_Side, const std::vector<double> & polynomial);

        double transmittance(FenestrationCommon::Side t_Side);

    private:
        CScatteringLayer m_Layer;
    };