Automatic diagnosis upon repeat failures

[smartin015]

Is your feature request related to a problem? Please describe.

Currently, behavior on retryable error detection is:

1. Restart current print
2. Restart current print
3. Restart current print
4. Bail out and stop the queue

This is pretty crude, and could be improved.

Describe the solution you'd like

Perform an automated "test print" if a single print has failed many times, to diagnose whether the failure lies with the print (e.g. bad orientation) or the printer (e.g. bed isn't sticky enough). It could alternatively wait until two prints in a row have retried and failed, to prevent excessive test prints.

This would allow bad print files to be set aside and the printer to continue without needing a human to decide whether to keep printing.

Additional context
#37