StateDB ZKInputs generation compatible with circom

- Add SignatureConstant to L1Tx.TxCompressedData
- ZKInputs generation works initial version working and compatible with circom Hermez circuit
    - Lots of small updates for circuits compatibility
- Update version (with new changes) of `go-iden3-crypto` & `go-merkletree`

common/tx_test.go

@@ -3,11 +3,21 @@ package common
 import (
 	"database/sql"
 	"database/sql/driver"
+	"encoding/binary"
+	"encoding/hex"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 )
 
+func TestSignatureConstant(t *testing.T) {
+	signatureConstant := uint32(3322668559)
+	var signatureConstantBytes [4]byte
+	binary.BigEndian.PutUint32(signatureConstantBytes[:], signatureConstant)
+	assert.Equal(t, SignatureConstantBytes, signatureConstantBytes[:])
+	assert.Equal(t, "c60be60f", hex.EncodeToString(SignatureConstantBytes))
+}
+
 func TestTxIDScannerValue(t *testing.T) {
 	txid0 := &TxID{}
 	txid1 := &TxID{}