Mconti1527/materials mconti material overhaul v2

See merge request !5

Totally redid this. All materials are now CC0 with sources for textures in the read me. All materials are set up in the OSPRay 2.0 format. The metals are the main attraction here but there are some really cool PBR ones as well.

Updated core OSPRay material library with a ton of new materials I have created over the past year. I’m new to Gitlab development so let me know if there is something that I did wrong or you have any questions.

update copper properties

Closes paraview#19074

See merge request !1

Thanks Michael Migliore for generating it.

all materials in this repository should be copyright clean
when you add a material document the copyright of its inputs in
the README.txt