TickByTickData

Field	Type	Description
`reqId`	`int32`	Unique request identifier used for tracking across EWrapper
`tickType`	`int32`	Type of data the tick represents.
`historicalTickLast`	`HistoricalTickLast`
`historicalTickBidAsk`	`HistoricalTickBidAsk`
`historicalTickMidPoint`	`HistoricalTick`