Fix #11016: Defer deletion of client and server game socket handlers

This fixes various use after free scenarios in error handling paths

src/network/core/tcp_game.h

@@ -154,7 +154,8 @@ public:
 class NetworkGameSocketHandler : public NetworkTCPSocketHandler {
 /* TODO: rewrite into a proper class */
 private:
-	NetworkClientInfo *info;  ///< Client info related to this socket
+	NetworkClientInfo *info;          ///< Client info related to this socket
+	bool is_pending_deletion = false; ///< Whether this socket is pending deletion
 
 protected:
 	NetworkRecvStatus ReceiveInvalidPacket(PacketGameType type);
@@ -543,6 +544,11 @@ public:
 
 	const char *ReceiveCommand(Packet *p, CommandPacket *cp);
 	void SendCommand(Packet *p, const CommandPacket *cp);
+
+	bool IsPendingDeletion() const { return this->is_pending_deletion; }
+
+	void DeferDeletion();
+	static void ProcessDeferredDeletions();
 };
 
 #endif /* NETWORK_CORE_TCP_GAME_H */