Core/Players: Allow players to answer gamemaster whispers even if whispers are disabled. Whitelist can be reset by .whispers off

src/server/game/Entities/Player/Player.h

@@ -128,6 +128,8 @@ typedef UNORDERED_MAP<uint32, PlayerTalent*> PlayerTalentMap;
 typedef UNORDERED_MAP<uint32, PlayerSpell*> PlayerSpellMap;
 typedef std::list<SpellModifier*> SpellModList;
 
+typedef std::list<uint64> WhisperListContainer;
+
 struct SpellCooldown
 {
     time_t end;
@@ -2467,7 +2469,13 @@ class Player : public Unit, public GridObject<Player>
         float GetAverageItemLevel();
         bool isDebugAreaTriggers;
 
+        void ClearWhisperWhiteList() { WhisperList.clear(); }
+        void AddWhisperWhiteList(uint64 guid) { WhisperList.push_back(guid); }
+        bool IsInWhipserWhiteList(uint64 guid);
+
     protected:
+        // Gamemaster whisper whitelist
+        WhisperListContainer WhisperList;
         uint32 m_regenTimerCount;
         float m_powerFraction[MAX_POWERS];
         uint32 m_contestedPvPTimer;