Create an Error enum

[MalekiRe]

Currently we only have Result which contains both Success and all the error variants, it would be nice if we could also have an Error enum that contains every error variant and withholds the single Success variant, and also a From implemention on our Result to an actual rust core::result::Result<(), Error> that allows us to easily manage XR function results.

Is this something you would be willing to accept a PR for?

[Ralith]

The high-level bindings already use a core::result::Result just fine. I don't think this would have any advantage over that existing pattern, and it would significantly degrade the behavior when statically unknown result codes arise.