Add the option to enter more than one pre-activity comment

The amount of fuel needed on the ride is becoming more and more important and I love to communicate this via the pre-activity comments.

At the same time, I find it important to include in the pre-activity comments the "why" of a certain workout. It would make everything less cluttered to be able to have more than one pre-activity comment!

Or you know, add editable total grams of CHO (or grams pr hour) to metrics in the workout section as part of the new fueling insights ;-)