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`.

common/block.go

@@ -13,3 +13,46 @@ type Block struct {
 	Hash        ethCommon.Hash `meddler:"hash"`
 	ParentHash  ethCommon.Hash `meddler:"-"`
 }
+
+// BlockData contains the information of a Block
+type BlockData struct {
+	Block Block
+	// Rollup
+	// L1UserTxs that were submitted in the block
+	L1UserTxs   []L1Tx
+	Batches     []BatchData
+	AddedTokens []Token
+	RollupVars  *RollupVars
+	// Auction
+	Bids                []Bid
+	Coordinators        []Coordinator
+	AuctionVars         *AuctionVars
+	WithdrawDelayerVars *WithdrawDelayerVars
+	// TODO: enable when common.WithdrawalDelayerVars is Merged from Synchronizer PR
+	// WithdrawalDelayerVars *common.WithdrawalDelayerVars
+}
+
+// BatchData contains the information of a Batch
+type BatchData struct {
+	// L1UserTxs that were forged in the batch
+	L1Batch bool // TODO: Remove once Batch.ForgeL1TxsNum is a pointer
+	// L1UserTxs        []common.L1Tx
+	L1CoordinatorTxs []L1Tx
+	L2Txs            []L2Tx
+	CreatedAccounts  []Account
+	ExitTree         []ExitInfo
+	Batch            Batch
+}
+
+// NewBatchData creates an empty BatchData with the slices initialized.
+func NewBatchData() *BatchData {
+	return &BatchData{
+		L1Batch: false,
+		// L1UserTxs:        make([]common.L1Tx, 0),
+		L1CoordinatorTxs: make([]L1Tx, 0),
+		L2Txs:            make([]L2Tx, 0),
+		CreatedAccounts:  make([]Account, 0),
+		ExitTree:         make([]ExitInfo, 0),
+		Batch:            Batch{},
+	}
+}