CURA-4451
- Add upgrade script for 3.0. to 3.1
- Upgrade old stack files so they will use "empty_quality" as the
"Not Supported" quality profile.
- Increase SettingVersion to 4
The stand-by temperature in the material profiles is the temperature at which the build plate levelling should be done. The actual stand-by temperature in Cura should be 100, so these profiles have to overwrite the material profile then.
Contributes to issue CURA-3960.
This removes all settings that are equal to the defaults. Some settings are 'common' between all profiles of the same material. I've let those settings bubble up to the material profiles but that change is then obviously only apparent in the fdm_materials repository.
Contributes to issue CURA-3960.
