Download models from DREM

[davidfsmith]

There have been a couple of requests to allow for models to be downloaded from DREM for manual uploading to the car via the car console. This would be especially useful at events where network performance is an issue, all models for the event can be downloaded prior to running (or during) rather than trying to send the models to the car ahead of racing.

(Thought: Could storage on the timer RPi (if present) be used to sync models)