Access to DefaultSignalPayload

[nevillco]

I am trying out a project that uses TelemetryDeck analytics on iOS via this SDK and on the backend via Vapor. It's working well and the combination of frontend/backend events allows for some clear insights/funnel analysis.

This SDK sends a number of default properties including appVersion, buildNumber, isTestFlight, isAppStore etc. via the DefaultSignalPayload. Several of these signals would be useful to pass to my backend events, but that's not currently possible because the associated values are internal. I would like to expose them to clients, but thought I'd start with an issue before a PR just because I'm not sure if it's something the maintainers want. Happy to raise a PR if it is.

[winsmith]

Oh yes please create a PR! Thank you :)

BTW you might also consider checking out the dedicated Vapor SDK: https://github.com/getsidetrack/vapor-telemetrydeck

[nevillco]

Yep, I am using that on the backend, and it works great! I'd just like to have its events also contain a appVersion, buildVersion, isAppStore etc. like the client events do, hence this feature request. PR here.

[winsmith]

Fixed by #126