Added option to use mouse wheel as zoomin/zoomout

[kvegeta]

Added an option to enable zooming with the mouse wheel without holding Ctrl, making one-handed use easier (e.g. when using AboveVTT on a tabletop without a keyboard).
Zoom In/Out buttons are now hidden when the option is enabled.

[Azmoria]

This currently prevents scrolling anywhere else there's a scrollable element. When wheelZoomAsToggle is true, you'll probably want to make sure the hovered element is #black_layer or inside #VTT.

I'll have to try some other devices too as this may interfere with touch pad. Often using gestures that send wheel events instead of right click drag. It might be ok anyway since it'd be optional.

[kvegeta]

it's maybe a good way to have the option only on desktop view/device? (that don't prevent as touchscreen input anyway)

[Azmoria]

Yeah, probably don't have to hide the setting but could ignore the setting if it's a scroll touchpad gesture that triggers a 'wheel' event.