oopsie 0.1.0-rc.12

Ergonomic, structured error handling: context selectors, traced errors, and rich colorized reports
Documentation 
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Injects trace-capture fields into every variant (or the struct): a backtrace, a
span trace, and the caller location, all enabled by default. The nested options
tune each part — mentioning one never disables the others — and `traced(false)`
opts the type out entirely. With `traced` active, an auto-generated error code is
also attached to each variant unless the nested `code` option disables it.

Forms: `traced`, `traced = true`, `traced = false`, `traced(true)`, `traced(false)`,
`traced(enabled = ...)`,
`traced(backtrace(...), spantrace(...), timestamp(...), location = ..., packed = ..., boxed = ..., code(...))`.

### Example
```
#[oopsie::oopsie(traced)]
pub enum AppError {
    #[oopsie("boom")]
    Boom,
}

fn main() {
    let err = app_oopsies::Boom.build();
    assert_eq!(err.to_string(), "boom");
}
```