Zoom with scroll wheel

[simbamangu]

Feature request for annotation: zoom with scroll wheel!

Expected behaviour:

Image zooms in/out at point under the cursor. Zoom level per click/roll should be user-selectable and default level fairly modest. At the moment the zoom icon zooms with factor 1.1:
let newHeight = window.imageHeight / 1.1;
In map applications a factor of 1.41 (√2) works well, might be worth a try as default.

[TanyaStere42]

Request overall accepted. Configuration request "Zoom level per click/roll should be user-selectable" is being pulled out for a later development effort