Merge branch 'master' into jgrpp-beta

# Conflicts:
#	.github/workflows/commit-checker.yml
#	src/company_cmd.cpp
#	src/console_cmds.cpp
#	src/crashlog.cpp
#	src/lang/english.txt
#	src/lang/german.txt
#	src/lang/indonesian.txt
#	src/lang/japanese.txt
#	src/lang/korean.txt
#	src/lang/swedish.txt
#	src/linkgraph/linkgraphjob.cpp
#	src/linkgraph/mcf.cpp
#	src/network/core/tcp.cpp
#	src/network/core/tcp.h
#	src/network/core/tcp_game.h
#	src/network/core/udp.h
#	src/network/network.cpp
#	src/network/network_admin.cpp
#	src/network/network_admin.h
#	src/network/network_chat_gui.cpp
#	src/network/network_client.cpp
#	src/network/network_client.h
#	src/network/network_func.h
#	src/network/network_internal.h
#	src/network/network_server.cpp
#	src/network/network_server.h
#	src/newgrf.cpp
#	src/newgrf_station.cpp
#	src/order_gui.cpp
#	src/rail_cmd.cpp
#	src/saveload/saveload.cpp
#	src/settings.cpp
#	src/settings_gui.cpp
#	src/settings_internal.h
#	src/settings_type.h
#	src/station_cmd.cpp
#	src/stdafx.h
#	src/table/currency_settings.ini
#	src/table/misc_settings.ini
#	src/table/settings.h.preamble
#	src/table/settings.ini
#	src/terraform_cmd.cpp
#	src/timetable_gui.cpp
#	src/train_cmd.cpp
#	src/tree_cmd.cpp
#	src/water_cmd.cpp

src/newgrf_config.h

@@ -115,6 +115,9 @@ struct GRFError {
 	GRFError(StringID severity, StringID message = 0);
 	GRFError(const GRFError &error);
 
+	/* Remove the copy assignment, as the default implementation will not do the right thing. */
+	GRFError &operator=(GRFError &rhs) = delete;
+
 	std::string custom_message; ///< Custom message (if present)
 	std::string data;           ///< Additional data for message and custom_message
 	StringID message;           ///< Default message
@@ -156,6 +159,9 @@ struct GRFConfig : ZeroedMemoryAllocator {
 	GRFConfig(const GRFConfig &config);
 	~GRFConfig();
 
+	/* Remove the copy assignment, as the default implementation will not do the right thing. */
+	GRFConfig &operator=(GRFConfig &rhs) = delete;
+
 	GRFIdentifier ident;                        ///< grfid and md5sum to uniquely identify newgrfs
 	uint8 original_md5sum[16];                  ///< MD5 checksum of original file if only a 'compatible' file was loaded
 	char *filename;                             ///< Filename - either with or without full path