Implement TryFrom<String> in EnumString

[wyatt-herkamp]

Implement TryFrom<String> during EnumString

If no default variant is provided it will just call FromStr other wise it will generate something similar to this

#[allow(clippy::use_self)]
impl ::core::convert::TryFrom<String> for Color {
    type Error = ::strum::ParseError;
    fn try_from(s: String) -> ::core::result::Result<Color, <Self as ::core::convert::TryFrom<String>>::Error> {
        ::core::result::Result::Ok(match s.as_str() {
            "RedRed" => Color::Red,
            "b" => Color::Blue { hue: Default::default() },
            "blue" => Color::Blue { hue: Default::default() },
            "y" => Color::Yellow,
            "yellow" => Color::Yellow,
            _ => return ::core::result::Result::Ok(Color::Green(s.into())), 
        })
    }
}

Could you please add the "hacktoberfest-accepted" label to the PR.

[Peternator7]

Hi @wyatt-herkamp, I like the idea of this PR, but I think it'll be a lot clearer if there's some additional refactoring done. Mostly, the MSRV for strum has been increased to 1.60 b/c of syn + quote so we don't need the conditional compilation anymore, and it's probably cleaner to define FromStr in terms of TryFrom rather than the other way around. If we do that, the bodies of TryFrom for &str and String are almost identical.

I see this is a hackathon PR; since it's near the end of Oct, I just wanted to see if it's the type of work you still have time for?

[wyatt-herkamp]

Hi @wyatt-herkamp, I like the idea of this PR, but I think it'll be a lot clearer if there's some additional refactoring done. Mostl

I already got the completion Then I learned they were no longer doing the t-shirts. So it really doesn't matter to me anymore.

I will working on the refactoring next week.

[wyatt-herkamp]

For some reason having the nostd tests in the same workspace as the regular tests was causing nostd to use the same macro. So it would add std code. I think this should fix it

[wyatt-herkamp]

@Peternator7 so I did not realize cargo weak features were not stabilized until Rust 1.61.

So the options are either.
- Where you have to add the macros depend separately to get the std features.
- Have a second feature inside the strum macro like derive_std
- or bump the minimum rust version to 1.61