Kevin O'Connor d3665699f1 klippy: Support generic printer_state() and stats() callbacks ...

Instead of hardcoding which objects are called on state transitions,
allow any "printer object" to be invoked if it has a printer_state()
method.  Convert connect, ready, shutdown, and disconnect callbacks to
this mechanism.

Similarly, allow all printer objects to provide a stats() callback.

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

2018-01-28 12:19:26 -05:00

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