[Mod request]Enhanced quen's visuals

[supersting85]

Many people seem to have missed this from E3 gameplay videos, but quen effect actually leaves trail behind the player as he moves. I think the same visual effect was introduced in B&W dlc, in one of the Mutagen skills(damage stacks on each opponent you kill to a upper limit, during which time you can see it). Also in E3 presentation, quen has lightening reflection which is visible on the player's body when it is active.