Adds sRGB EOTF conversion for rgb colors of materials

[rockjail]

sRGB EOTF conversion for RGBA values of materials

Rhino stores RGB values of materials in sRGB. Blender uses linear sRGB for this. This change adds a function to convert from sRGB to linear sRGB values using the sRGB EOTF

fixes / resolves

• colors of materials appearing washed out/ too bright in blender

Rhino

Blender with change:

Blender without change:

[jesterKing]

Thank you, merged.