[Issue/Refactor] io::Errors are hard to trace

[mrcjkb]

We have quite a few error enum variants like this one:

    #[error(transparent)]
    Io(#[from] io::Error),

This results in vague error messages like no such file or directory without any details about what action failed.

We should make all our functions that can return io::Error return their own type, with an appropriate error message.

[vhyrro]

we should return io::Errors but with an error message, which would greatly improve the UX, for sure.
I don't think we need a wrapper type, as our error already is the wrapper type :p

[mrcjkb]

Sure, if we can wrap io::Errors with io::Errors, that's fine by me.