[FEATURE] Add valuation to equipping Kramco during Barf

[Shiverwarp]

Right now we force equip Kramco if our chance of a sausage goblin is over 5%

  if (getKramcoWandererChance() > 0.05) {
    outfit.equip($item`Kramco Sausage-o-Matic™`);
  }

Ideally this is actually just a bonus value. We can build this bonus value based on garbo_valueOfFreeFight but this will probably be inaccurate since we're dressed for barf meat while equipping Kramco, so perhaps some reduced value based on not having a free fight familiar, which is usually the largest contributor to free fight value.

[horrible-little-slime]

Believe it or not, it is impractically terrible to come up with a good metric for this. It's just the absolute worst! Ask @phulin