Fix combat not working after logout; Fix DDS hits

* Removes the use of the MOB_STATE_CACHE and instead monkey patches a
  get_combat_state method onto Mob.

data/plugins/combat/combat_action.rb

@@ -7,7 +7,7 @@ class CombatAction < Action
 
     mob.attacking = true
 
-    @combat_state = get_combat_state(source)
+    @combat_state = source.get_combat_state
     @attack_timer = 100
     @once         = once
   end