Ctrl+C should be handled and terminate us at the nearest safe point

[Hoverbear]

While running an install/uninstall, we should be capturing any signals what would cause us to stop and delaying stopping until we are at the next place we mark an Action completed, so that if the user resumes or uninstalls we are still keeping their system clean.

[Hoverbear]

Right now if we are running some tokio::process::Command and the user CTRL+C's the signal will get sent to the entire process group, it seems the solution to this is to use setsid (https://docs.rs/nix/latest/nix/unistd/fn.setsid.html) and process_group (https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.process_group) to create a new process group which is lead by harmonic, this way it can feed them signals as desired without the user being involved.

This is added to Tokio so we just need to wait for a release: tokio-rs/tokio#5114

[Hoverbear]

New Tokio release, so this can get completed.