now uses refresh token to get new acces token if it doesn't have one

ie, user no longer needs to login each time
UI text updates for TrainingPeaks support
resistance value now presented in UI

kickr resistance now also only set when interaction with slider stops, this was spamming the kickr too much and causing a delay
added 15w buffer for max power

previously values plotted for actual power were capped at whatever the maximum for the workout was
bug fix, stop using refresh tokens that cause training peaks to crash