[WebHooks.Receivers.VSTS] WorkItemUpdatedFields is limited to a few predefined system fields

[NenoLoje]

This issue is for: Microsoft.AspNet.WebHooks.Receivers.VSTS

The WorkItemUpdatedFields class has 9 fields defined.

VSTS offers many more fields (system and custom ones) that could be part of this event as well. This does not seem to be implemented currently.

Questions:

1. How can I access other custom fields? Any plans to extend this class?
2. Would you be willing to accept PRs for other built-in system fields (like `System.IterationPath``)?

Thanks,
--Neno

[dougbu]

Suggest binding to a JObject and using the WebHookReceiverContext to get that type.

[danroth27]

We should look at improving this experience for ASP.NET Core as part of #182

[dougbu]

Pending work on #182, marking this up-for-grabs and putting it into the Backlog. If someone has VSTS fields e.g. @NenoLoje's System.IterationPath they would like to add, send a PR.

[aspnet-hello]

This issue was copied to aspnet/AspNetWebHooks#20

[aspnet-hello]

This issue was moved to aspnet/AspLabs#51