v8.14.0-rc1

This is test release of 8.14.

Changes for this release:

• expose location of interest when using attention based cropping [ejoebstl]
• remove autotools
• remove various obsolete scripts
• remove benchmark
• jp2ksave defaults to chroma subsample off, and jp2 write
• don't minimise vips_sink_screen() input after expose ... improves caching during interactive use
• require libjxl 0.6+
• add interlace option to GIF save [dloebl]
• magick load sets magick-format metadata [aksdb]
• add .pnm save [ewelot]
• threaded tiff jp2k and jpeg decompress
• improve speed and efficiency of animated WebP write [dloebl]
• add rgb mode to openslideload
• new thread recycler
• threadpools size dynamically with load
• operations can hint threadpool size
• faster dzsave
• support for N-colour ICC profiles
• add bash completions for vips
• fits load and allows many more bands
• fits write doesn't duplicate header fields
• add wrap to vips_text()
• GIF load supports truncated frames [tlsa]
• EXIF support for PNG load and save
• deprecate gifsave reoptimise, add reuse
• add encoder to heifsave [dloebl]
• add cplusplus meson build option [jcupitt]

Windows builds:

https://github.com/libvips/build-win64-mxe/releases/tag/v8.14.0-rc1