* Rewrite lightbox code
* Don't render offscreen images
* Scroll up to zoom in
* Support touch gestures
* Add reset zoom button
* Align top of image on original/fit horizontal
* Add scrollmode setting
* Add scale up option
* Add option to maintain zoom when transisitioning
* Fix image slideshow wrap around
* Wrap around on previous on first page/image
* Fix single page issues
* Fix two-pointer zoom mode incorrectly activated
