Make sure LogikSim either recovers or crashes on error instead of hanging

[hacst]

Currently a lot of error conditions leave LogikSim hanging. This is most likely due to threads not started as daemon still running in the background. To resolve this:

• Make sure threads are started as daemon
• Make sure we log when a daemon thread terminates for some other reason than a clean exit. Don't rely on it being terminated for us during normal operations.
• Make sure crashes in important threads are noticed and reacted to by the application