Imagecodecs

- Drop support for libjpeg.
- Fix encoding JPEG in RGB color space.
- Require ZFP 1.0.

- Add option to decode WebP as RGBA.
- Add option to specify WebP compression method.
- Use exact lossless WebP encoding.

- Add LZW encoder.
- Add QOI codec via qoi.h (37).
- Add HEIF codec via libheif (source only; 33).
- Add JETRAW codec via Jetraw demo (source only).
- Add ByteShuffle codec, a generic version of FloatPred.
- Replace imcd_floatpred by imcd_byteshuffle (breaking).
- Use bool type in imcd (breaking).

- Fix jpeg numcodecs with tables (28).
- Add APNG codec via libpng-apng patch.
- Add lossless and decodingspeed parameters to jpegxl_encode (30).
- Add option to read JPEG XL animations.
- Add dummy numthreads parameter to codec functions.
- Set default numthreads to 1 (disable multi-threading).
- Drop support for Python 3.7 and numpy < 1.19 (NEP29).

- Fix testing on pypy and Python 3.10.

- Require libjxl 0.6.x.
- Add CMS codec via Little CMS library for color space transformations (WIP).
- Add MOZJPEG codec via mozjpeg library (Windows only).
- Add SPNG codec via libspng library.
- Rename avif_encode maxthreads parameter to numthreads (breaking).
- Accept n-dimensional output in non-image numcodecs decoders.
- Support masks in LERC codec.
- Support multi-threading and planar format in JPEG2K codec.
- Support multi-resolution, MCT, bitspersample, and 32-bit in jpeg2k encoder.
- Change jpeg2k_encode level parameter to fixed quality psnr (breaking).
- Change jpegxl_encode effort parameter default to minimum 3.
- Change JPEG encoders to use YCbCr for RGB images by default.
- Replace lerc_encode planarconfig with planar parameter (breaking).
- Add option to specify omp numthreads and chunksize in ZFP codec.
- Set default numthreads to 0.
- Fix Blosc default typesize.
- Fix segfault in jpegxl_encode.
- Replace many constants with enums (breaking).