Scott Lahteine 7ec7bb31c4 Send a Busy signal to hosts during long processes, wait for input, etc ...

If Marlin is blocking the serial input or command queue for any length
of time (for example more than 2 seconds), it needs to send a message
to serial out to inform the host that it is busy. Marlin should only
send these messages out when busy, and preferably not when trying to
print formatted output.

2016-03-18 22:38:35 -07:00

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