Limit speeds to max feedrates of the printer
Limit speeds to max feedrates of the printer

Also number of slowdown layers is no longer limited by light speed.

Contributes to issue CURA-1049.

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