Currently only only 0 or 2 decimal places are supported. Implement automatic detection of precision.

This behavior is defined here:
https://github.com/swharden/ScottPlot/blob/72c5b01e6c232ec3f53ed02933832411bcda885c/src/ScottPlot/Axis.cs#L172-L178