Update StateDB to new & ExitInfo struct & BatchNum

Update StateDB to new & ExitInfo struct & BatchNum
Also a small fix at txselector & log packages

common/exittree.go

@@ -2,11 +2,13 @@ package common
 
 import (
 	"math/big"
+
+	"github.com/iden3/go-merkletree"
 )
 
 type ExitInfo struct {
 	AccountIdx  Idx
-	MerkleProof []byte
+	MerkleProof *merkletree.CircomVerifierProof
 	Balance     *big.Int
 	Nullifier   *big.Int
 }