No logical reason for it not to be in the terminal module anymore (the
set_and_join* functions predate the terminal module which is why they
weren't there to begin with).
Merge ui crate with root crate.
In preparation for uploading `meli` as a separate crate on crates.io.
Workspace crates will need to be published as well and having a separate
`ui` crate and binary perhaps doesn't make sense anymore.
Manos Pitsidianakis