Changing LED colour gradient according to temperature sliders

Changing LED colour gradient according to temperature sliders

v1
- the colour of the LED reflects the temperature of both sliders
  at the same time
- colour gradient starts from blue and ends with red:
  for low and high temperatures, respectively.

v2
- removed all A/C code
- paths are read from a predefined variables

v3
- removed trailing spaces and converted tabs to spaces

v4
- changed some tabs to space where appropriate and removed unnecessary code

Change-Id: I989d6779c0a72b9def74bc9bcf41ae01d368ba8a
Signed-off-by: Yordan Dimitrov <y.dimitrov.14@gmail.com>