ENH: Allow for custom presets prefix and tooltips

[johan-andruejol]

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Although Slicer allowed to create custom presets for the Slice views, it did not allow the user to customize the tooltip nor the prefix that would show in the view. It is now possible to customize each of the slice views preset to have a custom prefix and/or tooltip.

[pieper]

Can you add a note about why (in what use case) you want to use these options?

[johan-andruejol]

@pieper: Sure ! When you add a custom preset, the tooltip always shows "Oblique" as if you were in a "Reformat" view, which is weird for users. As an example:

Before this, the only way to modify this would have been to find the qMRMLSliderWidget for each qMRMLSliceControllerWidget and manually change each tooltip and each prefix. This would have to be repeated whenever you change layout as well.

[pieper]

Ah - 👍 thanks!