Allow 256 NewGRFs in multiplayer

Add extended network format for server info
Add general UDP packet fragmentation system
Fix map dimensions >= 64k
Increase length of server revision string
Maintain backwards compatibility with trunk for advertisement/server listing

src/network/network_internal.h

@@ -144,7 +144,7 @@ void NetworkAddServer(const char *b);
 void NetworkRebuildHostList();
 void UpdateNetworkGameWindow();
 
-bool IsNetworkCompatibleVersion(const char *version);
+bool IsNetworkCompatibleVersion(const char *version, bool extended = false);
 
 /* From network_command.cpp */
 /**