Add a PlatformPhysics class to handle some details about keeping objects on the printer platform
Add a PlatformPhysics class to handle some details about keeping objects on the printer platform

quillford/Cura,ad1217/Cura,markwal/Cura,lo0ol/Ultimaker-Cura,Curahelper/Cura,DeskboxBrazil/Cura,totalretribution/Cura,quillford/Cura,hmflash/Cura,bq/Ultimaker-Cura,lo0ol/Ultimaker-Cura,fieldOfView/Cura,markwal/Cura,derekhe/Cura,fieldOfView/Cura,fxtentacle/Cura,Curahelper/Cura,hmflash/Cura,derekhe/Cura,senttech/Cura,senttech/Cura,ad1217/Cura,fxtentacle/Cura,DeskboxBrazil/Cura,ynotstartups/Wanhao,totalretribution/Cura,ynotstartups/Wanhao,bq/Ultimaker-Cura