Map Txs: create a mechanism to map these to our orders in the database

[matt-auckland]

• Check Tx addresses against the database and map Txs to orders
  • valid Tx must match order value +/- x%
  • method returns an object:

{
    validTxs: [
      {
          Tx,
          Order 
      }
    ],
    invalidTxs: [
        {
          Tx,
          Order : Order || false (no matching order found)
        }
    ] 
}

• Recheck continuously using the preflight loop