Properly handle concurrent poison pill drop and dying from the opponent's poison pill

It is possible that a player drops a pill and eats the opponent's pill all in the same turn. TurnMarshaller did not take this possibility into account. The effect of this was that the player would have used the poison pill, but would not have respawned.

This change makes provision for this scenario by making sure the player is respawned in addition to using its own poison pill.