[Feature Request] Alternate zooming controls

[Demkeys]

Hello, I'd like to request additional zoom controls for FCNN and LeNet styles. Something that doesn't involve using the mouse wheel. For example, Blender has settings you can enable where you can hold down Ctrl+Alt+LMB and then move your mouse up and down to zoom in or out. Alternatively even introducing the AlexNet style zoom (MMB move mouse up/down) into the other two styles would work.

[alexlenail]

I'm open to it. Would gladly review a PR.