Merge remote-tracking branch 'origin/new-lua-features' into rewrite-lua

This is the first of a few commits to merge the new lua features and the
rewrite

include/Client.h

@@ -13,6 +13,11 @@
 
 class TServer;
 
+#ifdef WIN32
+// for socklen_t
+#include <WS2tcpip.h>
+#endif // WIN32
+
 struct TConnection final {
     SOCKET Socket;
     struct sockaddr SockAddr;