Use crossterm instead of console

[swenson]

So that the terminal doesn't get corrupted after running the emulator.

Fixes #38

[helloxiling]

Hi Chris, could you please elaborate on the root cause of the original issue? How does crossterm library help fix it? The code changes here are very similar to how console processed the key event.

[swenson]

@helloxiling There's a long-standing issue with console where it leaves the terminal in a bad state when you hit Ctrl-C console-rs/console#172

The easiest way around this is to use a different crate that handles that edge case a little better. I did some testing and crossterm doesn't seem to have the same issue.

[swenson]

Thanks!