Add change data type item to context menu
Add change data type item to context menu

Allows toggling between volume and tilt series

OpenChemistry/tomviz,mathturtle/tomviz,cjh1/tomviz,Hovden/tomviz,mathturtle/tomviz,cryos/tomviz,cryos/tomviz,mathturtle/tomviz,thewtex/tomviz,cryos/tomviz,OpenChemistry/tomviz,thewtex/tomviz,OpenChemistry/tomviz,cjh1/tomviz,Hovden/tomviz,cjh1/tomviz,OpenChemistry/tomviz,thewtex/tomviz