Save default material colour statically
Save default material colour statically

So if you wish to change that colour, you only need to change it in one place.

Contributes to issue CURA-340.

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