feature(node): ERC20 and ETH support

[micahriggan]

Can now sync ETH and get wallet history for ERC20 tokens

Refactoring currency support into a module system. This allows the creation of 3rd party modules, and arbitrary currency support without forking.

ETH Syncing via

      "ETH": {
        "mainnet": {
          "chainSource": "p2p",
          "trustedPeers": [
            {
              "host": "127.0.0.1",
              "port": 30303
            }
          ],
          "provider": {
            "host": "127.0.0.1",
            "protocol":"ws",
            "port": 8546
          }
        }
      }

Testing

I've been testing with this local development node

alias parity-dev="/Users/micah/blockchains/eth/parity2.4.2 --config dev --base-path '/Users/micah/blockchains/eth/dev' --db-compaction ssd --cache-size 8192 --jsonrpc-cors=all --ws-origins=all --ws-apis=all"

and this private key
0x4d5db4107d237df6a3d58ee5f70ae63d73d7658d4026f2eefd2f204c81682cb7 imported into metamask

[nitsujlangston]

if this is streaming why does it await?

[micahriggan]

eRRoR

[nitsujlangston]

if this is streaming why does it await?

[nitsujlangston]

if this is streaming why does it await?

[micahriggan]

So interesting thing I learned. If there's a throw inside of an async method that streams, then you'll get an unhandled promise rejection if you don't await that method.

[micahriggan]

sparse

[justinkook]

fix pruneTxs always empty object

[micahriggan]

Thanks!