### Added
- support new x-large (512px) and xx-large (1024px) sizes from standard
- cli: support "-n" arg to return a thumbnail only if it already exists
- thumbnail metadata now includes "Software" key with app name or vignette name

### Changed
- MagickBackend: for image files, add width/height info in thumbnail

### Removed
- dropped python3 support

### Fixed
- "TryExec" key can be missing in gnome-thumbnailer files
- PilBackend: fix bad original size saved in thumbnail metadata
- extra metadata passed to create_thumbnail is not ignored anymore
- for image source files, EXIF orientation is respected when creating thumbnail
- PilBackend: try to fully load thumbnail in case of attribute not found
- MagickBackend/QtBackend: don't expand images bigger than thumbnail size