0029516: Visualization - eliminate redundant property Graphic3d_MaterialAspect::Refle...

0029516: Visualization - eliminate redundant property Graphic3d_MaterialAspect::ReflectionMode()

Decomposition of Ambient, Diffuse, Specular and Emissive properties has been eliminated within *Graphic3d_MaterialAspect* definition,
so that following methods of *Graphic3d_MaterialAspect* class have been removed:
SetReflectionMode(), SetReflectionModeOn(), Ambient(), Diffuse(), Emissive(), Specular(), SetAmbient(), SetDiffuse(), SetSpecular(), SetEmissive().

Graphic3d_NOM_NEON_GNC non-physical material definition has been corrected
and define WHITE emission color coefficient instead of YELLOW.

Added method Graphic3d_ClipPlane::SetCappingColor() for more straight-forward modification of Capping color in case of non-physical material.
Prs3d_ShadingAspect::Color() has been fixed to return InteriorColor instead of material color coefficient in case of non-physical material.