[Feature request] Transparent thumbnail background

[eternal-sorrow]

Right now thumbnails are generated with white background. This might not work as well with dark themes for example.

[krepa098]

This might be a good solution. My only concern would be files placed on the desktop having poor contrast depending on the user's wallpaper.

[eternal-sorrow]

Could be made a command line option. The user can override it by copying the stl.thumbnailer file into ~/.local/share/thumbnailers and editing the command line options.