Canonical definitions of home_dir, cargo_home, and rustup_home.

This provides the definition of home_dir used by Cargo and rustup, as well functions to find the correct value of CARGO_HOME and RUSTUP_HOME.

This crate previously used its own definition of home_dir on Windows to avoid rust-lang/rust#43321, but this was fixed in 1.85.0 so this crate now simply forwards to home_dir.

This crate further provides two functions, cargo_home and rustup_home, which are the canonical way to determine the location that Cargo and rustup store their data.

This crate is maintained by the Cargo team, primarily for use by Cargo and Rustup and not intended for external use. This crate may make major changes to its APIs or be deprecated without warning.

MIT OR Apache-2.0