Remove salt scuffing

[Vitatroll]

- Keep salt scuffy, but less so.
- Make salt smoke reveal a wraith and holy water smoke damage a wraith.
- Remind people that ecto-eyes are a thing.

Wraith is probably the least damaging (station-wise) antag - it deserves some compensation for that.

Spoiler!

I honestly think wraith is pretty well balanced, it's just that people don't feel that they can fight it. That lessens the tension on one side. Wraith might need a boost to endurance if we boost the defender's ability to retaliate