Colors in console output not working in conhost

[retep998]

When using cargo in the Windows console, it doesn't use colors. Even --color=always doesn't work. The output from rustc is colored though, just not cargo itself.

https://github.com/rust-lang/cargo/blob/master/src/cargo/core/shell.rs#L150-L172

It explicitly uses TermInfo and ignores Windows entirely. That function can't even be easily fixed due to it taking a Box<Write + Send>, so the API for Shell::create and every user of it would have to be changed.