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_server.cpp

@@ -481,7 +481,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::SendNewGRFCheck()
 		if (!HasBit(c->flags, GCF_STATIC)) grf_count++;
 	}
 
-	p->Send_uint8 (grf_count);
+	p->Send_uint32 (grf_count);
 	for (c = _grfconfig; c != NULL; c = c->next) {
 		if (!HasBit(c->flags, GCF_STATIC)) this->SendGRFIdentifier(p, &c->ident);
 	}