Investigate usage of thiserror to replace snafu

[slinkydeveloper]

At the moment, to generate library errors, we're using snafu. This library is more powerful than we need, we should investigate https://docs.rs/thiserror as alternative, since it provides only the features we really need

[elpiel]

If no one is working on this I want to pick it up for hacktoberfest.
I have experience with thiserror and it shouldn't be that hard to replace snafu

[slinkydeveloper]

My only problem with thiserror is that it still does not support no_std environments dtolnay/thiserror#64 , which we plan to support at some point #72 . I suggest you to go forward and start replacing snafu with thiserror so we can compare the two, then we'll figure out the no_std thing