New lighting model WIP

 From:  Frenchy Pilou (PILOU)
2801.26 In reply to 2801.25 
< Hidden curves will be displayed with a faint dashed line style and you can snap on to them with object snaps, is that the same function that you would want from the x-ray mode?
yes, and this will works when objects will have their own colors or we must choose unify colors mode?