Wahoo like coloured HR Datafiled

Based on the zone settings this heart rate data field will change it's colour. Nov24: I now managed somehow to get the field also running on the Edge 830, 1030, 1030plus and 1050.

2.4 - Small correction because of latest Firmware 2.3 - Minor positioning adjustements for all devices 2.2 - Minor positioning adjustements for 1050 2.1 - Minor adjustment for Beta users 2.0 - Corrected layout and added support for Edge 550 and 850 1.9 - Corrected polling HR Zones for specific sport of cycling 1.8 - Adjusted code for device detection. 1.7 - Added support for Edge 530, 540 (Solar) and 1030/Bontrager 1.6 - Finally found a way to make it look nicer for all devices. 1.5 - Added support for Edge 830, 1030, 1030plus and 1050. 1.4 - Adjusted field to reflect automatic color mode for display background 1.3 - Adjusted font colour change for heart rate zone 1 1.2 - Adjusted font colour for heart rate zone 1 1.1 - Adjusted font and also adjusted when to change colours.