Zipixel HEIC decoder — third-party notices and corresponding source

Unmodified libheif-js 1.23.2 WebAssembly browser bundle.
SHA-256 and measured sizes are recorded in tests/heic-to-jpg-report.md.
This bundle is loaded only on demand by the HEIC converter.

libheif-js: Copyright Kiril Vatev. LGPL-3.0.
https://github.com/catdad-experiments/libheif-js/tree/6ca00b818c0ff51cb2a5c75b9ce97d708083335a
Source/build scripts:
https://github.com/catdad-experiments/libheif-js/archive/6ca00b818c0ff51cb2a5c75b9ce97d708083335a.tar.gz
Package containing the exact distributed binary:
https://registry.npmjs.org/libheif-js/-/libheif-js-1.23.2.tgz

libheif 1.23.2: Copyright struktur AG and contributors. LGPL-3.0.
https://github.com/strukturag/libheif/tree/v1.23.2
Source (including build-emscripten.sh):
https://github.com/strukturag/libheif/archive/refs/tags/v1.23.2.tar.gz

libde265 1.0.15 (HEVC decoder): Copyright struktur AG and contributors. LGPL-3.0.
Source and build inputs:
https://github.com/strukturag/libde265/releases/download/v1.0.15/libde265-1.0.15.tar.gz

Distribution build workflow (libheif submodule and Emscripten configuration):
https://github.com/catdad-experiments/libheif-emscripten/tree/v1.23.2
https://github.com/catdad-experiments/libheif-emscripten/archive/refs/tags/v1.23.2.tar.gz

Full license texts are included alongside this file in LICENSE,
LICENSE-wrapper and LICENSE-libde265. No warranty is provided.
The decoder is a separate, replaceable JS/WASM module. To use a modified build,
replace libheif-bundle.js and keep its module factory interface; no proprietary
relinking step is required. The site's separate HEIC adapter pins the Embind
pointer API to this version and should be re-tested when the decoder changes.