oopsie 0.1.0-rc.7

Ergonomic, structured error handling: context selectors, traced errors, and rich colorized reports
Documentation 
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Sets the default process exit code for the error type, surfaced via
`Diagnostic::oopsie_exit_code` and used by `Report`'s `Termination` impl when
the error is returned from `main`. Accepts an integer literal in `1..=255`
(`0` is rejected: it denotes success, contradictory on an error path).

On an enum it applies to every variant that does not set its own `exit_code`;
on a struct it is the struct's exit code.

Forms: `exit_code = N`.

### Example
```
use oopsie::Diagnostic as _;

#[oopsie::oopsie]
#[oopsie(module(false), exit_code = 70)]
pub struct AppError {
    detail: String,
}

let err = AppOopsie { detail: String::from("boom") }.build();
assert_eq!(err.oopsie_exit_code().map(|n| n.get()), Some(70));
```