Image viewer function enhancement

[Evelyn92]

1. Multi-View Support

• Implement three orthogonal views (axial, sagittal, coronal).
• Enable slice-by-slice navigation (scrolling or sliders) in each view.
• Views should update independently or synchronously based on user control.

2. Interactive UI Buttons
   Add control buttons (or toggles) instead of keyboard combo:

• Clipping: Threshold or crop intensity values.
• Scaling: Adjust image intensity scale (e.g., window/level).
• In-place Operation: Toggle to apply changes directly to the loaded image or on a copy.

[MauroLeidi]

I created a new branch to this regard. The work is not finished, still need a lot of polishing. Additionally, once finished it should be extended to 4D and 5D. I am leaving for holidays now but I pushed current progress, as promised.