Improve CLI

[alexyer]

@NikitaSmall возьмешь?

[NikitaSmall]

Конечно возьму)

[alexyer]

👍

[alexyer]

@NikitaSmall merged PR. But I would ask you to implement proper handling of ^C/^D signals. I expect to close client using Ctrl+C/Ctrl+D as any other utility, so it's not how things are supposed to be now.
Also don't show error if the input is empty. Just skip the line.

Thank you.

[NikitaSmall]

I will handle it.