Fixes a few minor bugs:
- fix crash when encoding tiled
unciimages - fix crash in
heif_context_encode_grid() - fix querying the preferred colorspace for monochrome AVIF files
- error when using a chroma format or bit depth that is not supported by the Kvazaar plugin
- output proper error message when memory allocation failed and use user-defined security limits
- heif-dec: do not show progress when option
--quietit given