These materials are hard-coded in the optimisation script, so the optimisation script didn't know that those materials were materials and this caused a chain reaction where in the end the profile could only override XML-settings.
The Ultimaker 3 is now released, so we can make this data public. These are the Ultimaker 3 definition files (with their physical properties as Cura requires them, such as build volume) as well as its extruders, print cores, quality profiles and build plate mesh. And also for the Ultimaker 3 Extended. Modifications to the material profiles will be published in the fdm_materials repository.
Contributes to issue CURA-2737.
