Core/Common: Move the query callback header to the database project

* Also renames the header to it's correct name QueryCallback

(cherry picked from commit d4d199d765)

src/server/bnetserver/Server/Session.h

@@ -23,7 +23,7 @@
 #include "SslSocket.h"
 #include "Socket.h"
 #include "BigNumber.h"
-#include "Callback.h"
+#include "QueryCallback.h"
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/ssl.hpp>
 #include <google/protobuf/message.h>

src/server/database/Database/DatabaseWorkerPool.h

@@ -19,7 +19,7 @@
 #define _DATABASEWORKERPOOL_H
 
 #include "Common.h"
-#include "Callback.h"
+#include "QueryCallback.h"
 #include "MySQLConnection.h"
 #include "Transaction.h"
 #include "DatabaseWorker.h"

src/server/database/Database/QueryCallback.h

@@ -15,8 +15,8 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _CALLBACK_H
-#define _CALLBACK_H
+#ifndef _QUERY_CALLBACK_H
+#define _QUERY_CALLBACK_H
 
 #include <future>
 #include "QueryResult.h"
@@ -206,4 +206,4 @@ class QueryCallback_2
         QueryCallback_2& operator=(QueryCallback_2 const& right) = delete;
 };
 
-#endif
+#endif // _QUERY_CALLBACK_H

src/server/game/World/World.h

@@ -29,7 +29,7 @@
 #include "Timer.h"
 #include "SharedDefines.h"
 #include "QueryResult.h"
-#include "Callback.h"
+#include "QueryCallback.h"
 #include "Realm/Realm.h"
 
 #include <atomic>