[s1966] Implement CONDITION_DEAD_OR_AWAY

Usage of value1:
* 0: return true if player is dead (or NULL)
* 1: return true if all members of player's group is dead (or no player)
* 2: return true if all players in an instance are dead
* 3: return true if the source-creature is dead
Usage of value2:
  if value2 is provided, then this is taken as range. if the player is outside of this range the condition returns true as well

(based on commit [12446] - ac633db)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>