Move generating approximated circle to Polygon class
Move generating approximated circle to Polygon class

This is not specific to the build volume. It's more of a Polygon thing. Moved to Uranium.

Contributes to issue CURA-2407.

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