loco run - Handle shutdown for rude closes

[totten]

Steps to reproduce

Example 1:

1. In xfce-terminal, open a tab
2. Start loco run
3. In another tab, use kill -9 on the main thread
4. The daemons continue running, but there is no easy way to view/stop them.

Example 2:

1. In xfce-terminal, open a tab
2. Start loco run
3. Close the tab
4. The daemons continue running, but there is no easy way to view/stop them.

Why

The main process running in the terminal acts as monitor/watcher/controller. These scenarios kill the monitor but not kill the monitor-ees.

The implication seems to be that the kill mechanism for these examples does not go after the entire process-group.

Comments

This PR is supposed stop the services -- even if loco's original process is killed rudely.

However, it's still in draft. It only seems to fix the kill -9 scenario (1). For "close tab" scenario (2), it's not enough.