Add zstd and Xcompression-level support

[Ambyjkl]

Resolves #478

I've actually not tested this yet. Please let me know if this is what you're looking for.

[TheAssassin]

I've actually not tested this yet. Please let me know if this is what you're looking for.

I have no idea why you would submit a PR with untested code. It almost seems like you think we don't have the few minutes to write that code, but we have the time to test yours. At least you're honest, which is very much appreciated.

I didn't bother looking into it too deeply. There's more than just one workflow issue with this PR. I don't think it makes sense to review this any further.

[Ambyjkl]

Sorry I never got the chance to circle back. @TheAssassin sorry you feel that way, I didn't mean this PR to be an insult. I've never worked with this codebase before and I'm as busy as you are. I just wanted to understand if I'm headed in the right direction, so I can continue. If you don't have the time to help, feel free to close the PR.