Feedback Processing needs to consider App Environment

[tilo]

it can happen that the same user has multiple flavors of an app installed on the same iOS device, which will result in the same token for e.g. ios-development and ios-enterprise

In the feedback processing, it's important to handle the complete feedback instance,
not just feedback.device, but also feedback.app

Should be documented

[tompesman]

This is true for iOS only as the phone has a device token, Android has an unique token per application install. Documentation in the feedback_processor template should be sufficient I think.