Add option to only sort temporarily / always start new instance with default sorting

[fireattack]

I want my Xnview to sort files by name by default.

I sometimes sort the images by other ways in browser, but I only want it to do so temporarily.

When I restart Xnview MP, or run another instance, I want it to restart from sorting by name, not the last used one.

This is particularly annoying when you open an image directly from Windows explorer (so you go directly into viewer), start scrolling around (prev/next), and you find out it doesn't go the the images you expected because you used some weird sorting last time when you're running XnView MP.