Add function to get other properties than values from all extruders
Add function to get other properties than values from all extruders

I've made sure that the behaviour of getAllExtruderValues remains the same, so that this function may still be used by other pieces of code. It is now just a special case of getAllExtruderSettings. Please suggest a better naming scheme, if you like.

Contributes to issue CURA-2823.

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