Improve handling of saturated data

https://midetech.atlassian.net/wiki/spaces/EC/pages/1763835905/Saturation+Detection+Function

Saturation data destroys frequency information in particular, and should be excluded from that. Probably shouldn't be excluded from other calculations like RMS or average. It may make sense to allow the user to detect and filter the saturated data first, then it can be processed normally.