Export Training Plan to Polar Flow and Import Polar Flow Activities to TR

[IvyAudrain]

@Kevin_Hamer

One other thing, which I think might be higher on the prio list, is being able to export the workouts to Zwift files (.zwo

This is a separate feature request, but in the meantime, athletes share their workarounds for running Zwift and TrainerRoad together here: TrainerRoad and Zwift together?