Server-side image optimization

[PVNFU-28]

It would be really nice to have optional server-side image optimization using ECT.
it has to be optional though as it can use a lot of CPU power and make posting slower but it saves lots of bandwidth and memory.
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[Appleman1234]

That library doesn't have php bindings, there is already logic in place for thumbnail generation using imagemagick , so this would probably be a matter of adding option configurable image optimisation to post.php for a variety of filetypes, however it may block posting like PDF thumbnail generation, so it may need to wait until there is an asynchrous job queue, that posts the provided image immediately and then generates the optimized image afterwards and replaces it and regenerates the page.

However, most people want the image they upload to be the image they posted, without modifications.