Improved thread locks on Windows

Changed server thread locks to improve multithreading - work still to do though.
This is mostly MMF2Exts fixes; bluewing-cpp-server doesn't have UI so it doesn't need a separate processing thread as MMF2Exts uses it. However, it can have two writer threads, due to the ping timer thread.
The new lock system has separate locks for server client list, server channel list, server udp and a meta lock (for host/unhost, welcome message change, handler change).

Amended SSL client struct type, as well.

This should be official server build 34.

Lacewing/Lacewing.h

@@ -2141,7 +2141,14 @@ struct relayserver
 	// Expects you have already checked channel with that name does not exist.
 	std::shared_ptr<relayserver::channel> createchannel(std::string_view channelName, std::shared_ptr<lacewing::relayserver::client> master, bool hidden, bool autoclose);
 
-	mutable lacewing::readwritelock lock;
+	// handles unhost/host, welcome message change, handler change
+	mutable lacewing::readwritelock lock_meta;
+	// handles channel list modifications - only to the underlying vector, not to requests like leave or close requests
+	mutable lacewing::readwritelock lock_channellist;
+	// handles client list modifications - only to the underlying vector, not to requests like disconnect requests
+	mutable lacewing::readwritelock lock_clientlist;
+	// handles UDP?
+	mutable lacewing::readwritelock lock_udp;
 
 	typedef void(*handler_connect)		(lacewing::relayserver &server, std::shared_ptr<lacewing::relayserver::client> client);
 	typedef void(*handler_disconnect)	(lacewing::relayserver &server, std::shared_ptr<lacewing::relayserver::client> client);

Lacewing/PhiAddress.cc

@@ -319,6 +319,7 @@ void LacewingFatalErrorMsgBox2(const char * const func, const char * const file,
 	err << "Lacewing fatal error detected.\nFile: "sv << fileSub << "\nFunction: "sv << func << "\nLine: "sv << line;
 #ifdef _WIN32
 	MessageBoxA(NULL, err.str().c_str(), "" PROJECT_NAME " fatal error", MB_ICONERROR);
+	std::abort();
 #else
 	char output[512];
 	strcpy(output, err.str().c_str());