PATCH: Split QR code viewers (X11/Wayland)

[jman]

Hello,

The tools used to open the PNG with the QRcode (`gm`, `display` and `feh`) are not compatible with
Wayland, I assume they work with Xwayland enabled but not without.

My proposal is to read $DISPLAY and $WAYLAND_DISPLAY separately and in case the second one is set,
then use a image viewer that works also with pure Wayland, i.e. without Xwayland (which sets
$DISPLAY, it I remember correctly).

I currently use `imv` but I am open to add more, as long as they work also without Xwayland.
https://sr.ht/~exec64/imv/

Happy to receive feedback.

Cheers,

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