Add MAIN_SEPARATOR_STR
Currently, if someone needs access to the path separator as a str, they need to go through this mess:
```rust
unsafe {
std::str::from_utf8_unchecked(slice::from_ref(&(MAIN_SEPARATOR as u8)))
}
```
This PR just re-exports an existing path separator str API.
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| benches | ||
| primitive_docs | ||
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| build.rs | ||
| Cargo.toml | ||