Add support for paths that are not valid Rust Strings

[ericcornelissen]

Feature Request

Summary

Currently, rm only supports paths that are valid Rust strings due to the use of String in the CLI Args definition:

rust-rm/src/main.rs

Lines 102 to 103 in 330275d

	/// The paths to remove.
	paths: Vec<String>,

This limits what paths can be removed to those paths that can be represented by a Rust String. However, depending on the system, paths could contain characters that cannot be represented by this type. Hence, the Rust OsString should be used instead to make sure any file can be rmed.

Notes

This was originally raised in #38 (comment).