GetOrderRequestCurrency pipeline

Order	Pipe	Description
100	GetCurrencyFromItemOuts	Uses the most common PunchOutOrderRequest.PunchOutOrderRequestItemOut.UnitPriceCurrency to get currency from Currency repository.
200	GetCurrencyFromCustomerOrder	Uses CustomerOrder.Currency.
300	GetCurrencyFromWebsiteDefault	Uses ICurrencyRepository to get default currency by website.
400	GetCurrencyFromApplicationDefault	Uses ICurrencyRepository to get default currency by application.