Allow reply to whispers if you are under CONFIG_CHAT_WHISPER_LEVEL_REQ, and implement feature for GMs to remove single players from their WhisperWhiteList.

src/server/game/Server/WorldSession.cpp

@@ -477,6 +477,9 @@ void WorldSession::LogoutPlayer(bool save)
         ///- Remove pet
         _player->RemovePet(NULL, PET_SAVE_AS_CURRENT, true);
 
+        ///- Clear whisper whitelist
+        _player->ClearWhisperWhiteList();
+
         ///- empty buyback items and save the player in the database
         // some save parts only correctly work in case player present in map/player_lists (pets, etc)
         if (save)