fix tty mode

[yazgoo]

For tty mode, this fixes the following issues after the refactoring

1. adds optional sound
2. enable raw-mode to support keys

[mohanson]

You turned on the audio in the tty, but the reason why I turned off the audio is that I want to be able to compile and run the emulator normally without an audio device (for example, via ssh), what do you think?

[yazgoo]

Hi, SSH will still work with this since audio is disabled by default.
My feeling is that the functionality will still be usefull in other cases.

[mohanson]

On computers without audio equipment (such as Linux server), cpal cannot be compiled. I hope to support this by adding tty mode. This requires audio to be disabled.

[yazgoo]

👌, Here is a proposal (see adding audio feature commit):

add an "audio" flag, enabled by default.
If one wants tty without audio, compile with:
--no-default-features --features tty
I one wants tty with audio, compile with:
--no-default-features --features tty,audio

[mohanson]

Great!