V5 Beta Feature request: Make swipe up/down customizable

[acwolff]

On a PC I use the down-arrow key to show the location of the photo, see my test album.

On a mobile device I should like to use the swipe-down gesture to display the location, but currently a swipe-down closes the lightbox.

I should like to use the swipe-up gesture for another function like opening a panorama viewer, or a Share function.

If no special functions are defined for the swipe gestures, the lightbox should be closed as is implemented now.

But if both swipe-up and swipe-down are used for special functions, it would be nice if tapping outside the image closes the lightbox as is already done on a PC.