Add multi-region launcher support

Add custom launcher as well as support for both the original TW and JP
launchers.

signserver/session.go

@@ -47,6 +47,8 @@ func (session *Session) handlePacket(pkt []byte) error {
 	bf := byteframe.NewByteFrameFromBytes(pkt)
 	reqType := string(bf.ReadNullTerminatedBytes())
 	switch reqType {
+	case "DLTSKEYSIGN:100":
+		fallthrough
 	case "DSGN:100":
 		session.handleDSGNRequest(bf)
 		break

signserver/sign_server.go

@@ -64,6 +64,8 @@ func (s *Server) acceptClients() {
 }
 
 func (s *Server) handleConnection(sid int, conn net.Conn) {
+	fmt.Println("Got connection to sign server")
+
 	// Client initalizes the connection with a one-time buffer of 8 NULL bytes.
 	nullInit := make([]byte, 8)
 	_, err := io.ReadFull(conn, nullInit)