Feature: Calculate estimated remaining range

[GekkoGit]

Calculate and display estimated remaining range by extrapolating average consumption from last 20/40/100km according to the user settings.

I.e, if the user has selected to display graphical data for the last 40 km, the estimated remaining range should be calculated using the average consumption for the last 40 km and the remaining SoC. The estimated remaining range should be an optional dataset for the Y2 axis along with a numeric display somewhere in the UI.

The request is posted since, at least, Polestar isn't able to calculate proper estimated remaining range.

[Ixam97]

I've looked into some similar feature a while ago, but discarded it after it didn't work out as good as I wanted and Polestar introduced dynamic range estimates with an OTA. I'll keep this in mind for later but it is not a priority.

[GekkoGit]

The dynamic range estimate by Polestar contains some hardcoded limitations (confirmed by Polestar), making it pretty useless. Having a simple extrapolated range estimate, solely based on (limited distance) historic consumption, would be very nice and useful.
Thanks for considering it.