ds18b20: Allow some read errors

Allows a limited number of DS18B20 read failures
before stopping the printer. This is designed to
tolerate spurious read errors, while still stopping
for serious issues.

The printer will stop when the sensor

fails to report a value five times in a row.

Implementation works as follows:
The MCU reports any read errors using a new "fault"
parameter in its answers.
The Python code tracks the number of errors
and triggers the shutdown. This paves the way for
more sophisticated error handling in the future,
as well as an example for other sensors to follow.

Signed-off-by: Lorenzo Pfeifer <Lorenzo.Pfeifer+github@googlemail.com>

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