LibThreading: Wake up the background worker thread when there's work

The worker thread used for BackgroundAction was going to sleep for
1 second at a time (when there was nothing to do.) This made using
background actions for anything interactive quite unresponsive since
you had to wait up to 1 second before it even started on your task.

We now use a simple Unix pipe to signal the worker thread that a new
work item is available.

This makes Assistant way more responsive when typing. :^)

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