adds ctrl+scroll for zooming

[normanrz]

Adds Ctrl+scroll for zooming in and out of ortho planes. This also enables pinch-to-zoom on mac trackpads.

Notes:

• Flight mode doesn't have a scroll-based zoom
• Should we also use ctrl+move for moving (as analogue to alt+move)?

Steps to test:

• Open a dataset
• Use ctrl+scroll to zoom in
• Use pinch-to-zoom on a Mac trackpad

Issues:

• fixes Zoom with track pad #5213

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• Updated (unreleased) changelog
• Updated documentation if applicable
• Ready for review

[philippotto]

Works well 👍 Maybe it's a worth a changelog entry?

[normanrz]

Maybe it's a worth a changelog entry?

Will do

What do you think about Ctrl+Move?

[philippotto]

What do you think about Ctrl+Move?

I don't have a strong opinion about this, but I'm rather leaning against it. In the past, I noticed that it's easy to move accidentally while zooming via alt+scroll. If we separate the modifiers (alt for moving and ctrl for zooming), we could mitigate this. Also, I'm not super convinced by the alt+mouse-move shortcut. Personally, I'd find something like space+drag more intuitive. Changing from alt to ctrl doesn't really improve it imo. Changing it later once again might be too much churn.