Zoned HR Label

Motivated by Forerunner watches where we have a heart icon colored to the current HR zone, I have developed a similar Data Field for the Edge Devices! Weirdly that Edge doesn't have a similar data label as other devices in the Garmin lineup so it must mean their teams might not be talking with each other ehehehhe. Anyway, please use this data field to have the same colored zone functionality as the HR display on Forerunner devices

- internal optimizations for increased battery life - reverted heart icon scaling to version 1.1.0 on smaller devices - improved heart and text scaling for Edge X50 devices