Contributes to CURA-1278
* settings_rework: (224 commits)
Improve slice trigger documentation
Import Cura in materials preferences page so we can use the active definition id
Add layer height to high quality profile so we have something that changes
Update example XML material to use the right product names
Filter available materials by the machine definition
Show the add machine dialog when we do not have an active machine
Create machine-specific material containers for machine specific overrides in XML material files
When creating a new container stack, add empty containers for things where we cannot find containers
Add preferred variant, material and quality to UM2+ definition
Account for global container stack being None in the backend plugin
Use the global stack instance variable and account for it potentially being None
Store the global container stack as an instance property
Added wildcard to filtering
Per object settings filter now uses correct bool types (instead of strings)
Removed stray = sign.
Fix creating print job name
Disable asynchronous loading of SettingItem when Qt Version < 5.5
Document QTbug
Properly serialise all settings to g-code file
Document GCodeWriter class
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