Fix gaining podopile/cumslut crashing

Randomly gaining the podophile/cumslut quirks (a 5% chance on each
footjob/fellatio after having sex 10 times) tried to add a
"FeetSlut"/"Cumslut" trait, which don't exist. The code didn't handle
this and thus added a null trait to a pawn, which then causes lots and
lots of nullpos.

I fixed the spelling mistakes and moved those traits into xxx to be
loaded during static initialization, like the rest of 'em.