Mafia: More requested stuff

-onDeadRoles can now be silent;
-onDeadRoles now can be set to trigger more often during the night;
-Fix onDeadRoles not activating because the player that had it prevented the list from being complete;
-Added voteMultiplier (a vote that multiplies the number of votes a player received)
-Added night action Guard (A protect-like ability that allows the author to define which commands are blocked)
-Added more options to define how many players will appear when using Watch on someone.