Shift away from `term` crate

[kinnison]

The term crate is unmaintained. cf. Stebalien/term#93

It is recommended we shift to termcolor (https://crates.io/crates/termcolor)

Whatever the move is toward, it ought to be away from an unmaintained and troublesome crate.

[kinnison]

Doing this may solve #1800

[jens1o]

I'd like to take this. :)

[kinnison]

@jens1o Cool, thank you, if you want to discuss things, you should come onto the Rustup discord on https://discord.gg/cKdYFVz and we can talk.

[omang777]

I like this.

[pickfire]

I believe this is solved?

[kinnison]

I believe this is solved?

@pickfire At this time we're still using term because we had issues with other options