Kevin O'Connor f8750b142f klippy: Rework shutdown handling ...

If an MCU signals a shutdown from the background thread, notify the
main thread and handle the shutdown there.  Dispatch shutdown handling
from the main Printer() class instead of from the Toolhead class.
This simplifies the shutdown logic.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

2017-10-12 16:28:53 -04:00

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