Codechange: [Network] split CloseSocket and CloseConnection more clearly (#9261)

* Codechange: [Network] split CloseSocket and CloseConnection more clearly

- CloseSocket now closes the actual OS socket.
- CloseConnection frees up the resources to just before CloseSocket.
- dtors call CloseSocket / CloseConnection where needed.

src/network/core/udp.h

@@ -49,8 +49,6 @@ protected:
 	/** The opened sockets. */
 	SocketList sockets;
 
-	NetworkRecvStatus CloseConnection(bool error = true) override;
-
 	void ReceiveInvalidPacket(PacketUDPType, NetworkAddress *client_addr);
 
 	/**
@@ -187,10 +185,10 @@ public:
 	NetworkUDPSocketHandler(NetworkAddressList *bind = nullptr);
 
 	/** On destructing of this class, the socket needs to be closed */
-	virtual ~NetworkUDPSocketHandler() { this->Close(); }
+	virtual ~NetworkUDPSocketHandler() { this->CloseSocket(); }
 
 	bool Listen();
-	void Close();
+	void CloseSocket();
 
 	void SendPacket(Packet *p, NetworkAddress *recv, bool all = false, bool broadcast = false);
 	void ReceivePackets();