Stopping (some) actors without stopping the daemon #24
Description
At this stage if one actor breaks, especially when if it closes a channel, then is like a signal for closing a system - the even broker will exit (with no panic). But the systems should be able to operate without some actors (i.e. telemetry or QMK). If they crash, the broker should exclude them, the daemon should clean up whatever left of them, and the system should move on. Eventually some monitoring event could be issued.
Optionally - a restart/retry strategy could be introduced.
On the other hand - some actors are essential - i.e. KeScanner, KeyWriter. If they fail, we may try to retry, but at the end the system can't operate without them. So we have different classes of actors - to be considered.