feat(Core/Packets): Port packet handling from TrinityCore (#5617)

* feat(Core/Packets): Port packet handling from TrinityCore

* 1

* 2

* 3

* 1

* 2

* #3670

* 3

* 1

* codestyle

* fix msvc warnings

src/server/game/Server/WorldSocket.h

@@ -31,6 +31,11 @@ class ACE_Message_Block;
 class WorldPacket;
 class WorldSession;
 
+namespace WorldPackets
+{
+    class ServerPacket;
+}
+
 /// Handler that can communicate over stream sockets.
 typedef ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH> WorldHandler;