Rust rewrite

[imLinguin]

The work has already begun and is available on separate branch https://github.com/imLinguin/comet/tree/rust

Why?

I had to rewrite comet nevertheless, as current code-base has some wrong assumptions and is not offline ready at all.
That said I might as well switch to the language I'm learning at the moment.

Planned features

While I'm keeping track of supported calls in the README, here's the list of what else will be possible with new comet.

• Stats and achievements while offline
• Complete offline mode - disable sync to GOG services

Other ideas

Crazy ideas that I might work on someday

• Decky loader plugin for displaying achievements "natively" on Steam Deck
• Overlay support - still need to do research on this

If you have any other cool ideas, don't hesitate to share them.
Thanks for interest in the project!