Reorganize Cast to expose the cli logic as pub

[ewoolsey]

Motivation

I'm writing a cli tool and I would like to be able to run cast programatically. Currently this isn't possible, as the logic to run the cli is hidden inside /bin.

Solution

I've made the project structure of cast similar to that of anvil which exposes it's internals more liberally. Currently I have this:

pub mod cmd;
pub mod opts;
pub mod tx;

which may be exposing more than we want/need. I would like some feedback on exactly what we should/could be making public. Thanks!

[DaniPopes]

What exactly do you need from the binary crate? Making CLIs private was an intentional choice