Rename MatrixRTCoefficient_ --> MatrixRTCoefficients_v2

Core/Computation/SpecularComputationTerm.cpp

Core/Computation/SpecularComputationTerm.h

Core/Multilayer/MatrixFresnelMap.cpp

Core/Multilayer/MatrixFresnelMap.h

Core/Multilayer/MatrixRTCoefficients_v2.cpp

Core/Multilayer/MatrixRTCoefficients_v2.h

Core/Multilayer/SpecularMagnetic_.cpp

Core/Multilayer/SpecularMagnetic_.h

Tests/UnitTests/Core/Fresnel/SpecularMagneticTest_.cpp