Record data from Controllable trainer and PowerMeter

Feature Requests
1

To support dual power recording, when two power sources are available record both and save both.

For example if a Controllable smart trainer is being used, but power source is a PowerMeter, then the power data is recorded from both. In game and in the uploaded fit file the power saved is from the PowerMeter. But a second fit file is saved that has the power from the Controllable smart trainer.

2

This feature will only apply to few Zwift riders.

On the other hand, it is trivially attainable: just use an additional recording device (i.e., another cycling computer)