New lighting model WIP

 From:  okapi
2801.15 
hi michael,

good to see a new lighting model, this will be a good addition.

Regarding the object color, could there be an option to turn the color on for the surfaces / for surfcaes+lines / for lines only (with neutral surface colors).
I can imagine that sometimes too much color can get in the way. I could imagine I may want to turn the colour on sometimes only to check which styles are assigned to which objects.
Thanks,