Merge branch 'master' into jgrpp-beta

# Conflicts:
#	.github/workflows/ci-build.yml
#	src/lang/german.txt
#	src/lang/romanian.txt
#	src/lang/slovak.txt
#	src/lang/turkish.txt
#	src/network/core/address.cpp
#	src/network/core/tcp.h
#	src/network/core/udp.cpp
#	src/network/network.cpp
#	src/network/network_client.cpp
#	src/network/network_server.cpp
#	src/network/network_server.h
#	src/network/network_udp.cpp
#	src/openttd.cpp
#	src/saveload/newgrf_sl.cpp
#	src/tree_cmd.cpp
#	src/video/video_driver.hpp
#	src/window.cpp
#	src/window_gui.h

src/network/core/udp.h

@@ -211,7 +211,7 @@ public:
 	virtual ~NetworkUDPSocketHandler() { this->Close(); }
 
 	bool Listen();
-	void Close() override;
+	void Close();
 
 	void SendPacket(Packet *p, NetworkAddress *recv, bool all = false, bool broadcast = false, bool short_mtu = false);
 	void ReceivePackets();