As a user, I want to be able to see intensity values at the voxel the cursor is hovering over. The data value should be shown per layer.

UX ideas:

• expose those values in a sub menu in the context menu. thus, rightclicking would enable the user to look up those values. this would also enable to copy those values via a copy icon in the mnu.
• have a designated tool which shows a tool tip while moving the cursor.
  • how would the user copy values? still via right click?
  • should we integrate this into the existing color picker tool? we could generalize it to be a "voxel picker" and by default it activates a segment id via left click, but also informs about the data values in other layers. there could be a tool-specific switch in the tool bar that allows to re-assign the left click to copy the other data values (instead of activating a segment id).