Update synchronizer and DB with last contracts updates

- API
	- When updating network info, handle cases where no batches exists and
	  where no forgers exists
- cli/node
	- Update `cfg.buidler.toml` config file to a working version
- common
	- Add new smart contract structs and extend some existing ones to
	  reflect updates regarding events from the smart contracts
- SQL
	- Add new tables and extend existing ones to reflect updates regarding
	  events from the smart contracts
- db/historydb
	- Add functions to insert new smart contract events data
	- Fix unclosed rows that led to inconsistent sql driver state (replace
	  NamedQuery by NamedExec).  This fixes the error:
	  `pq: unexpected Parse response 'C'`
- db/l2db
	- Close rows after usage
- eth
	- In Rollup event, introduce a new UpdateBucketsParameter when there's a
	  SafeMode event, with `SafeMode = true`
- synchronizer
	- synchronize new events
	- avoid calling `auction.CanForge` before the genesisBlock to avoid
	  getting a revert.

common/ethwdelayer.go

@@ -1,6 +1,10 @@
 package common
 
-import ethCommon "github.com/ethereum/go-ethereum/common"
+import (
+	"math/big"
+
+	ethCommon "github.com/ethereum/go-ethereum/common"
+)
 
 // WDelayerConstants are the constants of the Withdrawal Delayer Smart Contract
 type WDelayerConstants struct {
@@ -12,6 +16,16 @@ type WDelayerConstants struct {
 	HermezRollup ethCommon.Address `json:"hermezRollup"`
 }
 
+// WDelayerEscapeHatchWithdrawal is an escape hatch withdrawal of the
+// Withdrawal Delayer Smart Contract
+type WDelayerEscapeHatchWithdrawal struct {
+	EthBlockNum int64             `json:"ethereumBlockNum" meddler:"eth_block_num"`
+	Who         ethCommon.Address `json:"who" meddler:"who_addr"`
+	To          ethCommon.Address `json:"to" meddler:"to_addr"`
+	TokenAddr   ethCommon.Address `json:"tokenAddr" meddler:"token_addr"`
+	Amount      *big.Int          `json:"amount" meddler:"amount,bigint"`
+}
+
 // WDelayerVariables are the variables of the Withdrawal Delayer Smart Contract
 type WDelayerVariables struct {
 	EthBlockNum int64 `json:"ethereumBlockNum" meddler:"eth_block_num"`