Improve CLI interface

Mark most of the parameters as advanced and clearly sperate IO and control
parameters.
Also mark input body labelmap as label so the interface does not detect
greyscale images along, but only labelmaps.

See Issue #13917
Merge branch '13917-MarkCLIVolumeAsLabels' into heat-diffusion

* 13917-MarkCLIVolumeAsLabels:
  Improve CLI interface