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Add a class for a QCustomPlot SI prefix axis ticker, using format_units, and supporting both linear and log scales. Use this for all the known IO Graph unit types (except don't try to interpret BASE_UNIT_STRING yet.) Use this to replace automatically scaling the data, avoiding a lot of expensive floating point calculations for busy graphs. This should make it easier to support smaller intervals eventually (see #13682). Fix #12827. Fix #14661.
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