Idea: Default NPC images to a class/role image

[periwinkle15]

Very low priority, but I think it'd be cool to have the image data for NPCs auto-populate to the token for their class role instead of to the no-image "image." I have no need to upload custom images for every single one of the dozens and dozens of NPCs I use, but I don't enjoy staring at the "no image data" notice while using active mode.