Adds a fullscreen image view option when you click on images
Controls:
└ Click on images to bring up the image viewer in a post list
└┬ Click again to close the viewer
└┬ Left Arrow: Previous image
├ Right Arrow / Spacebar: Next image
├ Up Arrow: Open the current image's post view webpage
└ Down arrow: close the viewer
Userscript menu option:
└ Current Image mode
└┬ Sample only: load the sample image of higher resolution ones if available
└ Always original size: ignore samplesCompatible and designed to work with Gelbooru Endless Scroll