Merge branch 'dev' into v2.1.12

Merge pull request #14 from awxkee/dev

Rebuild pixart

Merge pull request #12 from awxkee/high_contrast

FIx EncodingOptions

Merge pull request #9 from awxkee/new_decoding_enc

grop libyuv reference

Merge pull request #8 from awxkee/new_decoding_enc

grop libyuv reference

Merge pull request #7 from awxkee/new_decoding_enc

updates decoding with alpha

Merge pull request #6 from awxkee/new_decoding_enc

Adding new decoder and encoder

Merge remote-tracking branch 'origin/master'

small updates, libavif update, libdav1d update

improve encoder byte ordering and rescaling to even