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Allow using `?` with Status again

See merge request redox-os/uefi!5

The previous change broke callers using `?` on things that returned
Status. Implement FromResidual for Result to fix it.

Also enables the `control_flow_enum` feature.
Signed-off-by: Tim Crawford <tcrawford@system76.com>

Use try_trait_v2 for Status

See merge request redox-os/uefi!3

`try_trait` was replaced by a new implementation. The RFC was used as a
reference, as it documents a simple use case that nearly matches the
current Status [1]. Fixes compiling with rustc versions newer than
2021-05-18.

Tracking Issue: https://github.com/rust-lang/rust/issues/84277

[1]: https://github.com/rust-lang/rfcs/blob/master/text/3058-try-trait-v2.md#implementing-try-for-a-non-generic-type

Signed-off-by: Tim Crawford <tcrawford@system76.com>

TODO: Add types for messaging device path