Merged form factor material decorators into FormFactorDecoratorMaterial (for both matrix and scalar materials); moved matrix evaluate to IFormFactor; removed FormFactorPol

Refactor: rename form factor decorators containing material information to FormFactorDecoratorScalarMaterial and FormFactorDecoratorMatrixMaterial

Refactored FormFactor chain: transformation now sits in Particle; wavevector scattering factor and scattering density reside in the same class (FormFactorDecoratorRefractiveIndex and FormFactorDecoratorMaterial for scalar and matrix scattering respectively)

Moved to LayerSpecularInfo for polarized calculations (removed MagneticCoefficientsMap completely); Xcode project adapted

Removed OpticalFresnel completely (no longer needed; functionality has been replaced by SpecularMatrix)

Moved layer matrix coefficients to unnested class (outside SpecularMagnetic) with the right interface (ILayerRTCoefficients)

Added HomogeneousMagneticMaterial class to represent magnetic materials for polarized neutron scattering