Add option to preserve metadata

[zachalig]

There are a number of situations where I want to compress and resize images for work, but need to preserve the metadata (like copyright information and the description), even though it adds to the file size. Having a setting that allows you to preserve this data would be amazing.

I love this tool! Thank you so much for creating it. I use it near daily.

[flozz]

Hello,

This repository is about the GUI for YOGA Image. This option must be implemented in the YOGA library first to be available in this GUI.

There is currently an opened ticket about this here: https://github.com/wanadev/yoga/issues/36

:)