Archimedean spiral

STATE_FORWARD was changed: After going into the STATE_FORWARD the Ardumower drives forward until motorSpiralStartTimeMin is reached and mow motor current goes above motorMowPowerThreshold (indicating that unmoved area with longer gras was reached). At this point the Ardumower starts to drive an achimedian spiral with a width determined by the motorSpiralFactor.

Three new pfod variables:

Motor: motorSpiralStartTimeMin default value: 6 sec

motorSpiralFactor default value: 30 sec

Mow: motorMowPowerThreshold default value: 15 W

New internal variable: lastSetSpiralStartTime starting timepoint of the current spiral

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