Implement group loot for chest having GroupLootRules (go type=3, data15=1).

Implement round robin loot.
Implement round robin for underthreshold items (group loot and need befor greed).
Fix "all players pass" bug on creature.
Add SMSG_LOOT_LIST message to indicate looter (round robin or master).
And some other minor loot bugs.

Fixes issue #167.
Fixes issue #247.

--HG--
branch : trunk

src/game/GameObject.h

@@ -708,6 +708,9 @@ class GameObject : public WorldObject, public GridObject<GameObject>
 
         Loot        loot;
 
+        uint32 m_groupLootTimer;                            // (msecs)timer used for group loot
+        uint64 lootingGroupLeaderGUID;                      // used to find group which is looting
+
         bool hasQuest(uint32 quest_id) const;
         bool hasInvolvedQuest(uint32 quest_id) const;
         bool ActivateToQuest(Player *pTarget) const;