feat: temperature rate of change

[matmen]

This PR adds a Rate of Change column for heater temperatures to the Thermals card, toggleable via a new settings context menu (disabled by default).
The calculated rate of change is based on a rolling average of the last 5 data points to filter out sensor reading fluctuations. Absolute deltas of < 0.05 are filtered out to prevent a constant flipping of the RoC sign when the RoC is ~0.
Discussion is welcome. Closes #409.

[StuSerious]

Love this!
Super useful in multi extrusion printing to get the switch times just perfect, and overall a cool metric to monitor and brag about!

[Biorn1950]

@matmen what do you think to have all the settings icons aligned next to the arrow like that:

everything else is ok.

[matmen]

I must have overlooked that. Fixed.

[Biorn1950]

LGTM

[matmen]

Screenshot on Thermals Chart needs to be updated, and settings dropdown may need to be documented?

[NyxCode]

Love this feature - however, I'd like to see this for all thermistors. Especially for a chamber thermistor this would be awesome.

[pedrolamas]

Love this feature - however, I'd like to see this for all thermistors. Especially for a chamber thermistor this would be awesome.

@NyxCode that has just been added, it's available right now on the develop branch and will be part of the next release! 🙂