[7269] Use enum type for battleground queue type ids, and related cleanups.

* renamed a variable to make the content of it more clear: type->arenaslot
    * renamed BattleGroundQueueTypeId-variables to bgQueueTypeId
      just to make it easier reading the code (cause there existed
      3 different names for this..)
    * renamed GetBattleGroundQueueId to GetBattleGroundQueueTypeId
      again this is just for better understanding
    * Renamed [GS]etQueueType and m_Queue_type
    * Renamed to [GS]etQueueId and m_QueueId

Author: balrok

--HG--
branch : trunk

src/game/Group.h

@@ -23,6 +23,7 @@
 
 #include "GroupReference.h"
 #include "GroupRefManager.h"
+#include "BattleGround.h"
 #include "LootMgr.h"
 
 #include <map>
@@ -250,7 +251,7 @@ class TRINITY_DLL_SPEC Group
         void ConvertToRaid();
 
         void SetBattlegroundGroup(BattleGround *bg) { m_bgGroup = bg; }
-        uint32 CanJoinBattleGroundQueue(BattleGroundTypeId bgTypeId, uint32 bgQueueType, uint32 MinPlayerCount, uint32 MaxPlayerCount, bool isRated, uint32 arenaSlot);
+        uint32 CanJoinBattleGroundQueue(BattleGroundTypeId bgTypeId, BattleGroundQueueTypeId bgQueueTypeId, uint32 MinPlayerCount, uint32 MaxPlayerCount, bool isRated, uint32 arenaSlot);
 
         void ChangeMembersGroup(const uint64 &guid, const uint8 &group);
         void ChangeMembersGroup(Player *player, const uint8 &group);