Allow Smartsheet webhooks to specify scope

Damien Miller

Even though there is clearly some intended future functionality for Smartsheet webhooks to only subscribe to certain updates (a row or a cell for example) currently only a scope of sheet and every type of event is supported. This means that developers using Smartsheet webhooks have to trawl through often large amounts of obsolete webhook data to find the parts they need.

It would be awesome if the "events" and "scope" functionality of Smartsheet webhooks was properly implemented.