Set colours of extruder selection to material colour
Set colours of extruder selection to material colour

Ubuntu Unity doesn't seem to listen to these colours at all though.

Contributes to issues CURA-1278 and CURA-351.

ynotstartups/Wanhao,ynotstartups/Wanhao,Curahelper/Cura,hmflash/Cura,fieldOfView/Cura,hmflash/Cura,fieldOfView/Cura,totalretribution/Cura,senttech/Cura,Curahelper/Cura,senttech/Cura,totalretribution/Cura