Correctly handle interrupt signal in pipelines

[topheman]

The snakepipe gamestate command needs to crossterm::terminal::enable_raw_mode() in order to catch user inputs.

The Ctrl+C is handled manually:

• https://github.com/topheman/snake-pipe-rust/blob/master/src/gamestate/game.rs#L154-L158
• https://github.com/topheman/snake-pipe-rust/blob/master/src/gamestate/mod.rs#L33-L36
• https://github.com/topheman/snake-pipe-rust/blob/master/src/main.rs#L143-L147

The problem

When you launch a pipeline like:

snakepipe gamestate|snakepipe render-browser|snakepipe render

You need to hit Ctrl+C twice to exit.

This might be related to https://github.com/topheman/snake-pipe-rust/issues/25