Added property for target bed temp
Added property for target bed temp

CURA-1339

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