Backend state is now set to processing when cura frontend is done sending
Backend state is now set to processing when cura frontend is done sending

This is instead of waiting for the backend to send it's first progress message.
This gives the feel of a more snappy response.

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