Add nearest-neighbour view mode

[eye-wave]

Small images mostly pixel art doesn't look great with interpolation. My suggestion would be to either add a toggle for it, or detect automatically, either if the image is smaller than some threshold or for png only if the image color space is an indexed palette.

[ggand0]

Thanks for your suggestion. I've tested nearest-neighbor filtering and it does look better on small pixel art images (png). Auto-detection is interesting, but I'll probably start with adding a manual toggle in the settings.