Add tooltip to extruder-tabs
Add tooltip to extruder-tabs

CURA-333

senttech/Cura,hmflash/Cura,Curahelper/Cura,senttech/Cura,fieldOfView/Cura,fieldOfView/Cura,ynotstartups/Wanhao,hmflash/Cura,ynotstartups/Wanhao,totalretribution/Cura,totalretribution/Cura,Curahelper/Cura