Generate average/median of measurements for a given headphone

[jamesWalker55]

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

There are usually multiple measurements for a given headphone, and they can differ from one another quite significantly.

^ The red line (crinacle's measurement) is the default measurement when selected on the menu:

Some headphones like Truthear Hola have wildly different measurements in the higher frequencies:

Describe the solution you'd like

Rather than trying each measurement one by one until I get a good result, I might suggest generating an average/median of all measurements for every headphone.

Using median might be a better since it can help weed out any outlier measurements.

Describe alternatives you've considered
N/A

Additional context
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