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Redesign OverrideCfg to be more typed
Redesigns the `OverrideCfg` type so that validity is represented in the type system, i.e. "Parse, don't validate". Probably fixes some subtle bugs when no toolchain is named in a rust-toolchain.toml, implicitly selecting the default toolchain, but the default toolchain isn't displayed as active by `rustup list toolchain` and the like. Also fixes a bug where the `RUSTUP_TOOLCHAIN` erroneously had priority over a `+toolchain` command line override.
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