Add VotingResample CLI

The CLI is added as is. Thanks to Patrick Reynolds for his contribution.
Update VotingResample to Bender standards

* Make the CLI templated so it can be used over any image type.
* Remove ResampleZ option. Resampling should be done over all the image
direction
* Add spacing input field so the user can specify the desired output
spacing.
* Enforce input and output labelmaps
Add VotingResample to the workflow

This step will reduce the size of the labelmap before it's meshed by
Cleaver. This will help to reduce the computational time and address the
memory comsumption issues.
Add missing workflow property to SkinModelMakerUseSkinLabelLabel