Symbols signaling status of a process and similar are duplicated in
three different crates. Also two different symbols to signal success are
used:
1. ✓ ( Check Mark, U+2713)
2. ✔ (Heavy Check Mark, U+2714)
Work against that by referring to `radicle-term` from the other crates.
The `radicle-signals` crate only supports Unix, so using it prevents
`radicle-term` to build on Windows.
Of course, this means that non-Unix platforms will not support any
signal handling at all, but at least we can build.
Fintan Halpenny
Erik Kundt
Lorenz Leutgeb