Merge pull request #289 from mp4ra/codepoint-request-1740415346

Add `sato` to Item References

Author: podborski

data/item-references.csv

@@ -16,3 +16,4 @@ pred,Predictively coded item reference,item ref.,HEIF
 prem,Pre-Multiplied item,item ref.,MIAF
 tbas,HEVC Tile track base item reference,item ref.,HEIF
 thmb,Thumbnail image item reference,item ref.,HEIF
+sato,Sample Transform Derived Image Items combine input pixel values using basic mathematical operations,item ref.,AVIF