Added zoomin and zoomout events

[jhhend]

Hello there,

We use simplelightbox and found that one of our clients wanted extra functionality added to the lightbox when the user zoomed in/out of an image. I achieved the functionality we needed via a MutationObserver, but thought that events which can be triggered on zoom would be quite helpful.

I understand that this is not comprehensive, since it does not cover pinch zooming or double tapping - I am open to hearing thoughts on how to make this more comprehensive, if needed, just opening this request for visibility.

Thanks so much for your commitment and dedication to maintaining this tool.

[Mtillmann]

Hi @jhhend this looks like a great addition. Thanks for opening the PR. I think this is a good addition for the next major-ish release

[jhhend]

Hi @jhhend this looks like a great addition. Thanks for opening the PR. I think this is a good addition for the next major-ish release

This is great to hear. Let me know of any extra functionality or requirements this would need to meet the standards for release. I will be watching this thread.