Update missing parts, improve til, and more

- Node
	- Updated configuration to initialize the interface to all the smart
	  contracts
- Common
	- Moved BlockData and BatchData types to common so that they can be
	  shared among: historydb, til and synchronizer
	- Remove hash.go (it was never used)
	- Remove slot.go (it was never used)
	- Remove smartcontractparams.go (it was never used, and appropriate
	  structs are defined in `eth/`)
	- Comment state / status method until requirements of this method are
	  properly defined, and move it to Synchronizer
- Synchronizer
	- Simplify `Sync` routine to only sync one block per call, and return
	  useful information.
	- Use BlockData and BatchData from common
	- Check that events belong to the expected block hash
	- In L1Batch, query L1UserTxs from HistoryDB
	- Fill ERC20 token information
	- Test AddTokens with test.Client
- HistryDB
	- Use BlockData and BatchData from common
	- Add `GetAllTokens` method
	- Uncomment and update GetL1UserTxs (with corresponding tests)
- Til
	- Rename all instances of RegisterToken to AddToken (to follow the smart
	  contract implementation naming)
	- Use BlockData and BatchData from common
		- Move testL1CoordinatorTxs and testL2Txs to a separate struct
		  from BatchData in Context
	- Start Context with BatchNum = 1 (which the protocol defines to be the
	  first batchNum)
	- In every Batch, set StateRoot and ExitRoot to a non-nil big.Int
	  (zero).
	- In all L1Txs, if LoadAmount is not used, set it to 0; if Amount is not
	  used, set it to 0; so that no *big.Int is nil.
	- In L1UserTx, don't set BatchNum, because when L1UserTxs are created
	  and obtained by the synchronizer, the BatchNum is not known yet (it's
	  a synchronizer job to set it)
	- In L1UserTxs, set `UserOrigin` and set `ToForgeL1TxsNum`.

cli/node/cfg.example.toml

@@ -16,11 +16,17 @@ TTL          = "24h"
 [Web3]
 URL = "XXX"
 
-[TxSelector]
-Path = "/tmp/iden3-test/hermez/txselector"
-
-[BatchBuilder]
-Path = "/tmp/iden3-test/hermez/batchbuilder"
-
 [Synchronizer]
 SyncLoopInterval = "1s"
+
+[SmartContracts]
+Rollup   = "0xEcc0a6dbC0bb4D51E4F84A315a9e5B0438cAD4f0"
+Auction  = "0x500D1d6A4c7D8Ae28240b47c8FCde034D827fD5e"
+TokenHEZ = "0xf784709d2317D872237C4bC22f867d1BAe2913AB"
+
+[EthClient]
+CallGasLimit        = 300000
+DeployGasLimit      = 1000000
+GasPriceDiv         = 100
+ReceiptTimeout      = "60s"
+IntervalReceiptLoop = "200ms"