[Image Resizer] Add option for alternative encoders

[shawnweisfeld]

It would be awesome if the tool would have an option to minify the images when resizing, like the minifier on Tiny PNG https://tinypng.com.

[Dreadaxe]

Same idea for jpeg
Like JPEG.rocks, re-encodes images using a lossy algorithm, so the quality looks exactly the same for a human eye, but the size can be reduced by a big factor. Under the hood uses mozjpeg, a rock solid tool that has been in development for many years.
https://jpeg.rocks/about