Make CuraEngineBackend respond to changes to the global container stack
Make CuraEngineBackend respond to changes to the global container stack

This way we can properly connect to propertyChanged signals and trigger
a reslice.

Contributes to CURA-1278

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