Brightness control in the tray

Forum members 'FeodorF' and 'BologneChe' alerted me that this is missing:

https://forum.puppylinux.com/viewtopic.php?p=23044#p23044

I have compiled 'setcolortemperature' package in OE. This has the 'sct' executable.

Added this to the package-list for Easy, as well as the 'brightness-control' PET that provides the tray operation (and uses sct).  

Tags: easy