Core/Commands: Enable SQL query logging by config and command )patch by leak)

Closes issue 4853.

--HG--
branch : trunk

src/server/game/Chat/Chat.h

@@ -236,6 +236,7 @@ class ChatHandler
         bool HandleServerShutDownCommand(const char* args);
         bool HandleServerShutDownCancelCommand(const char* args);
         bool HandleServerSetClosedCommand(const char* args);
+        bool HandleServerToggleQueryLogging(const char* args);
 
         bool HandleServerSetLogFileLevelCommand(const char* args);
         bool HandleServerSetDiffTimeCommand(const char* args);