Blender Git Loki

Fix T73575: Zooming out a lot faster than zooming in

- Zooming out a lot faster than zooming in,
it had the wrong aspect ratio, make all the preparations
with the factors instead of deltas.
- Improved following the `zoom_invert`
(should not apply to `MOUSEZOOM`) and "trackpad natural scroll"
preferences.
- `zoomfac` adjustment, same as in `view_zoomdrag_modal`.

Ref D8686