Core: Some optimizations

- Declare some functions const
- Fix some mem leak
- Fix some resource leak
- Remove unused variables and functions
- Remove duplicate functions
- Reduce the scope of some variables
- Remove unused file

--HG--
branch : trunk

src/server/game/Battlegrounds/Battleground.h

@@ -373,7 +373,7 @@ class Battleground
         uint32 GetScriptId() const          { return ScriptId; }
         uint32 GetBattlemasterEntry() const;
         uint32 GetBonusHonorFromKill(uint32 kills) const;
-        bool IsRandom() { return m_IsRandom; }
+        bool IsRandom() const { return m_IsRandom; }
 
         // Set methods:
         void SetName(char const* Name)      { m_Name = Name; }
@@ -569,9 +569,9 @@ class Battleground
         virtual bool HandlePlayerUnderMap(Player * /*plr*/) { return false; }
 
         // since arenas can be AvA or Hvh, we have to get the "temporary" team of a player
-        uint32 GetPlayerTeam(uint64 guid);
-        uint32 GetOtherTeam(uint32 teamId);
-        bool IsPlayerInBattleground(uint64 guid);
+        uint32 GetPlayerTeam(uint64 guid) const;
+        uint32 GetOtherTeam(uint32 teamId) const;
+        bool IsPlayerInBattleground(uint64 guid) const;
 
         void SetDeleteThis() {m_SetDeleteThis = true;}