Core/Movement: Add time synchronisation (Needs tested)

Port From (https://github.com/TrinityCore/TrinityCore/commit/c19a4db1c12b8864d6c486ee8e2f0e058fb4155a)

Source/Game/Networking/Packet.cs

@@ -220,7 +220,11 @@ namespace Game.Networking
 
         public uint GetOpcode() { return opcode; }
 
+        public DateTime GetReceivedTime() { return m_receivedTime; }
+        public void SetReceiveTime(DateTime receivedTime) { m_receivedTime = receivedTime; }
+
         uint opcode;
+        DateTime m_receivedTime; // only set for a specific set of opcodes, for performance reasons.
     }
 
     public class PacketHeader

Source/Game/Networking/Packets/MiscPackets.cs

@@ -275,6 +275,8 @@ namespace Game.Networking.Packets
             ClientTime = _worldPacket.ReadUInt32();
         }
 
+        public DateTime GetReceivedTime() { return _worldPacket.GetReceivedTime(); }
+
         public uint ClientTime; // Client ticks in ms
         public uint SequenceIndex; // Same index as in request
     }

Source/Game/Networking/WorldSocket.cs

@@ -340,6 +340,9 @@ namespace Game.Networking
                             break;
                         }
 
+                        if (opcode == ClientOpcodes.TimeSyncResponse)
+                            packet.SetReceiveTime(DateTime.Now);
+
                         // Our Idle timer will reset on any non PING opcodes on login screen, allowing us to catch people idling.
                         _worldSession.ResetTimeOutTime(false);
 
@@ -812,10 +815,7 @@ namespace Game.Networking
             lock (_worldSessionLock)
             {
                 if (_worldSession != null)
-                {
                     _worldSession.SetLatency(ping.Latency);
-                    _worldSession.ResetClientTimeDelay();
-                }
                 else
                 {
                     Log.outError(LogFilter.Network, "WorldSocket:HandlePing: peer sent CMSG_PING, but is not authenticated or got recently kicked, address = {0}", GetRemoteIpAddress());