scalar specular strategy now getting roughness model per argument

Core/Computation/SpecularComputation.cpp

GUI/ba3d/model/geometry/column.cpp

GUI/ba3d/model/geometry/sphere.cpp

Resample/DWBA/DWBA_Scalar.h

Resample/Processed/ProcessedSample.cpp

Resample/Specular/ISpecularStrategy.h

Resample/Specular/SpecularMagneticStrategy.cpp

Resample/Specular/SpecularMagneticStrategy.h

Resample/Specular/SpecularScalarNCStrategy.h

Resample/Specular/SpecularScalarStrategy.cpp

Resample/Specular/SpecularScalarStrategy.h

Resample/Specular/SpecularScalarTanhStrategy.h

Sample/Scattering/FormFactorDecoratorMaterial.cpp

Tests/UnitTests/Core/Sample/RTTest.cpp

auto/Wrap/doxygenResample.i