- adds SVT-AV1 encoder as AVIF backend
- dynamic plugin interface for installing codecs independently from libheif (currently Unix only)
- add XMP header compression (using zlib)
- library should now be initialized with
heif_init()
- heif_convert: extract EXIF and XMP to separate files
- heif_enc: add benchmarking function to compare codecs
- copy EXIF/XMP between HEIC/AVIF files and JPEG/PNG in all kinds of combinations
- remove EXIF orientation tag from input when converting to HEIC/AVIF and generate irot/imir boxes matching the input orientation