Release 21.12.0:
core:
* Add API to add images
* CairoOutputDev: Fix de-duping of Flate images
* Fix crash on broken files when using non-default ENABLE_ZLIB_UNCOMPRESS. Issue #393
* Minor code improvements
glib:
* Add API for validation of signatures
* Add API to read/save to file descriptor
utils:
* pdftohtml: Reduce sensitivity of duplicate detection. Issue #1117
build system:
* Increase C++ standard to 17
Exp-run by: antoine
PR: 260344
fd68e9e2b6