Add Ctrl+D shortcut to clear platform. Fixes #475
Add Ctrl+D shortcut to clear platform. Fixes #475

ynotstartups/Wanhao,totalretribution/Cura,bq/Ultimaker-Cura,Curahelper/Cura,ynotstartups/Wanhao,senttech/Cura,Curahelper/Cura,markwal/Cura,fieldOfView/Cura,hmflash/Cura,fieldOfView/Cura,markwal/Cura,bq/Ultimaker-Cura,senttech/Cura,totalretribution/Cura,hmflash/Cura