* Use craft-heif from craft-libs; remove crates/heif
PhotoCraft's HEIF decoder had drifted from LightCraft's by about 700 lines;
both now use craft-heif (storytold/craft-libs#784), built from LightCraft's
copy. HEIC colours now follow the HEVC VUI's range and matrix and libheif's
chroma upsampling. 8-bit files still open as 8-bit documents; a colour
description the VUI specifies now tags the image as an nclx did.
The codecs -> heif standalone exception ends with the local crate, and the
HEIF nextest step drops -p photocraft-heif, which no longer exists.
* Pin craft-heif to the merge of storytold/craft-libs#794
* heif: count the decoder's 16-bit buffer against max_alloc
* heif: match Apple's chroma upsampling; pin craft-heif to storytold/craft-libs#799
* heif: free the decoder's buffer before the HDR conversion and count that conversion's peak
* heif: hold the canvas the decoder really allocates to max_alloc
Dylan M. Taylor
5d4b68f04c