If it is impossible for other (non-wolf) roles to have killed at night,
we do not deduct from the traitor count. This logic isn't perfect yet,
but should cover the majority of cases.
As part of this, adjust team and accurate stats to no longer hide any
information. For team stats in particular, it was very misleading to
list traitor as villager, because it gives the village the impression
they have more time than they actually do (i.e. 2 wolfteam 5 vilteam
actually means 3 wolfteam 4 vilteam but that is not obvious). As team
stats were changed, team reveal was also changed to disregard hidden
traitor, so that the two can't be correlated to pick out if traitor died
(if traitor was revealed as vilteam but stats decremented wolfteam, that
would guarantee that traitor died).
Also commit groundwork for the stats rewrite, hidden behind an
"experimental" stats type (so it is not on by default). It is still very
WIP, many things do not yet work with it.
