Add tooltips and icon placeholders
Add tooltips and icon placeholders

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