Implemented option to provide steam guard code

[Leo963]

I have run into the issue that the account despite having Steam Guard off required steam guard code.

As referenced here it is a one-time thing so it can be well incorporated.

It used a command described here, set_steam_guard_code.

I believe this can make life easier.

[jonpas]

Wouldn't this require a pause and input? As when a new container starts it would send a new Steam Guard code.