Divide `get_body_parts_slut_score` into outfit/over/underwear to be more...

Divide get_body_parts_slut_score into outfit/over/underwear to be more additive, matching assumptions of methods such as decide_on_uniform_enhanced.

I've tried to keep the values logical and consistent with uniform policy, but lingerie is now a bit weird. It has surprisingly low underwear scores and surprisingly high full-outfit scores. This is because the new methods heavily weight (lack of) overwear. It play similarly enough, but I would like another set of eyes on these changes.