CLI: Add a signal handler to reset the cursor on interrupt

[ghost]

In CLI we use cargo-generate for init and new.

cargo-generate uses things like Select from dialoguer.

Those things hide your terminal's cursor for aesthetic purposes.

If you press Ctrl + C while those things are active, you will end up with a cursorless terminal.

See: console-rs/dialoguer#294

This PR adds a ctrlc signal handler to reset the cursor and exit.

[jkelleyrtp]

Thanks! Much better