Revise rules for showing operation buttons
Revise rules for showing operation buttons

- Issue MatterHackers/MCCentral#2852
Wrapping operation buttons should be hidden if not in scene root

mmoening/MatterControl,unlimitedbacon/MatterControl,larsbrubaker/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,mmoening/MatterControl