oopsie 0.1.0-rc.7

Ergonomic, structured error handling: context selectors, traced errors, and rich colorized reports
Documentation 
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Auto-fills this field via the `Capturable` trait when the error is constructed,
so it is excluded from the context selector instead of being caller-supplied.
Trace-typed fields (`Backtrace`, `SpanTrace`, packed traces) get this
automatically; `capture(false)` opts such a field back onto the selector.

Forms: `capture`, `capture = true`, `capture = false`, `capture(true)`, `capture(false)`.

### Example
```
#[oopsie::oopsie]
#[oopsie(module(false))]
pub enum AppError {
    #[oopsie("request {id} failed")]
    Failed {
        id: u32,
        #[oopsie(capture)]
        at: std::time::SystemTime,
    },
}

// `at` is captured automatically, so the selector only takes `id`.
let err = Failed { id: 7u32 }.build();
assert_eq!(err.to_string(), "request 7 failed");
```