[jlcompress] async/cancellable methods

[crueter]

Having the ability to cancel JlCompress would be very helpful, especially in cases where the user may want to cancel e.g. a large compress operation.

[crueter]

I ended up creating my own version of this. It's not perfect, especially the compress method which takes a long while to determine the total, but this can of course be optional and the callback can just be a std::function<bool()> that determines whether or not to cancel the operation.

https://git.eden-emu.dev/eden-emu/eden/pulls/2700/files#diff-7bf77c8a1d4f86e4d59bc904907f8069885970fb