(2022-04-11) [v2.3.1]

This is a minor release with some CAMBI extensions and speed-ups and adding it to AOM CTC v3, as well as a few minor fixes/cleanups.

• CAMBI extensions: full reference, PQ eotf, up to 16 bit-depth support, max_log_contrast parameter.
• CAMBI: option to output heatmaps.
• Many complier warnings cleaned up.