Rename p2 to arrowOffset, rebuild shape in ArrowOffset setter
Rename p2 to arrowOffset, rebuild shape in ArrowOffset setter

jlewin/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl