Update sing-box core, refactor MASQUE, update XHTTP

protocol/naive/inbound_conn.go

@@ -22,7 +22,7 @@ func generatePaddingHeader() string {
 	paddingLen := rand.Intn(32) + 30
 	padding := make([]byte, paddingLen)
 	bits := rand.Uint64()
-	for i := 0; i < 16; i++ {
+	for i := range 16 {
 		padding[i] = "!#$()+<>?@[]^`{}"[bits&15]
 		bits >>= 4
 	}