Process enabled rules in part mode, use sceneContext rather than printer
Process enabled rules in part mode, use sceneContext rather than printer

- Issue MatterHackers/MCCentral#2660
All toolbar operations enabled without selection in Part mode

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