Update etas timewindow

"Calculates the estimated time of arrival for all active deliveries on all active routes.

Updates all estimated arrival times for all deliveries on all routes which are in the status 'ontheway'. The values are stored as 'eta_from' and 'eta_to' in the delivery tables of the database an can be retrieved via GET /delivery for each delivery.
Calculation is done between the current position of a driver on each delivery's route and all deliveries each which must not be unassigned, (already) delivered or canceled.
The current and predicted traffic situation are considered in this call.
The relevant route and the referring driver are automatically derived from the given route.
All already delivered or canceled assignments must have set a correct status. Otherwise they will be falsely considered in this calculation."