This commit contains a multitude of fixes and some initial translation
work so the first rustc pass compiles.
It removes `unsafe extern "C"` declarations, so now there are a number
of errors about invocations of unsafe functions that need to be
addressed. They should each be scoped to an `unsafe` block so as to aid
in an eventual safe translation.
Some of the functions are now using the module system rather than
`extern "C"` bindings, but the translation is not complete.
- Adds initial `Cargo.toml` (and `Cargo.lock` to `.gitignore`)
- Deletes `tool` (it seems hard to `corrode`)
- Moves `lib/tests` => `tests` (we should figure out how to translate them)
- Moves `lib` => `src` to match Rust conventions
- Renames `lib/ykpiv.rs` => `src/lib.rs` to match Rust conventions
- Adds copyright from `ykpiv.h` to the top of all `*.rs` files
Tony Arcieri