Reduce images + recode non-PNGs to JPEG if they are too huge (#3956)

I.e. > 500K for the balanced media quality and 130K for the worse one. This can remove animation from PNG/WebP, but then a user always can send an image as a file. Also don't reduce wide/high images if they aren't huge. Among other benefits, this way most of PNG screenshots aren't touched. Also remove Exif from all images, not from JPEGs only.
chatmail · Mar 7, 2023 · 6fefbc0 · 6fefbc0
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -9,6 +9,7 @@
 - Check provider database with CI. #4099 
 - Switch to DEFERRED transactions #4100
 - Remove metadata from avatars and JPEG images before sending #4037
+- Reduce images + recode non-PNGs to JPEG if they are > 500K in size #4037
 
 ### Fixes
 - Do not block async task executor while decrypting the messages. #4079