make max transfers configurable

src/command_line.hpp

@@ -70,9 +70,12 @@ struct CommandLine {
 	// ---- TODO ----
 
 	// advaced dl:
-	// -I max_incoming_transfers (default 16)
-	// -O max_outgoing_transfers (default 4)
+	// -I max_incoming_transfers
+	size_t max_incoming_transfers {32};
+	// -O max_outgoing_transfers
+	size_t max_outgoing_transfers {16};
 	// -u request chunks only from UDP-direct peers
+	bool request_only_from_udp_peer {false};
 
 	CommandLine(int argc, char** argv);